10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

(Mark One)

þ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2012

or

TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from             to            

Commission File No. 001-35186

Spirit Airlines, Inc.

(Exact name of registrant as specified in its charter)

Delaware	38-1747023
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
2800 Executive Way Miramar, Florida	33025
(Address of principal executive offices)	(Zip Code)

(954) 447-7920

(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

Title of Each Class	Name of Each Exchange on Which Registered
Voting Common Stock, $0.0001 par value Non-Voting Common Stock, $0.0001 par value	NASDAQ Global Select Market None

Securities registered pursuant to Section 12(g) of the Act:

None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes  þ    No  ¨

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    Yes  ¨    No  þ

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  þ    No  ¨

Indicate by checkmark whether the registrant has submitted electronically and posted on its corporate Website, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  þ    No  ¨

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this

Form 10-K.  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer  þ     Accelerated filer    ¨      Non-accelerated filer   ¨     Smaller reporting company  ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).    Yes  ¨    No  þ

The aggregate market value of the common stock held by non-affiliates of the registrant was approximately $979.1 million computed by reference to the closing sale price of the common stock on the NASDAQ Global Select Market on June 29, 2012, the last trading day of the registrant’s most recently completed second fiscal quarter. Shares held by each executive officer, director and by certain persons that own 10 percent or more of the outstanding Common Stock have been excluded in that such persons may be deemed to be affiliates. This determination of affiliate status is not necessarily a conclusive determination for other purposes.

The number of shares of each registrant's classes of common stock outstanding as of the close of business on February 11, 2013:

Class	Number of Shares
Common Stock, $0.0001 par value per share	72,531,027

Documents Incorporated by Reference

Portions of the registrant's Proxy Statement for the registrant's 2013 Annual Meeting of Stockholders are incorporated by reference into Part III of this Form 10-K to the extent stated herein. The Proxy Statement will be filed within 120 days of the registrant's fiscal year ended December 31, 2012.

TABLE OF CONTENTS

PART I	Page
Item 1. Business	4
Item 1A. Risk Factors	12
Item 1B. Unresolved Staff Comments	28
Item 2. Properties	28
Item 3. Legal Proceedings	29
Item 4. Mine Safety Disclosures	29
PART II
Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters, and Issuer Purchases of Equity Securities	30
Item 6. Selected Financial Data	33
Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations	36
Item 7A. Quantitative and Qualitative Disclosures About Market Risk	58
Item 8. Financial Statements and Supplementary Data	59
Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	88
Item 9A. Controls and Procedures	88
Item 9B. Other Information	88
PART III
Item 10. Directors, Executive Officers and Corporate Governance	89
Item 11. Executive Compensation	89
Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	89
Item 13. Certain Relationships and Related Transactions, and Director Independence	89
Item 14. Principal Accountant Fees and Services	89
PART IV
Item 15. Exhibits and Financial Statement Schedules	90
Signatures	91

__________________________________________________ 

PART I

Cautionary Statement Regarding Forward-Looking Statements

This Annual Report on Form 10-K includes forward-looking statements within the meaning of Section 21E of the Securities Exchange Act of 1934, as amended, or the Exchange Act. Forward-looking statements may include words such as “believe,” “may,” “estimate,” “continue,” “anticipate,” “intend,” “expect,” “predict,” “potential” and similar expressions indicating future results or expectations, as they relate to our company, our business and our management, are intended to identify forward-looking statements. Forward-looking statements should not be read as a guarantee of future performance or results, and will not necessarily be accurate indications of the times at, or by, which such performance or results will be achieved. Forward-looking statements are based on information available at the time those statements are made and/or management's good faith belief as of that time with respect to future events, and are subject to risks and uncertainties that could cause actual performance or results to differ materially from those expressed in or suggested by the forward-looking statements. Important factors that could cause such differences include, but are not limited to: the competitive environment in our industry; our ability to keep costs low; changes in our fuel cost; ability to hedge fuel requirements; restrictions on or increased taxes applicable to non-ticket revenues; the impact of worldwide economic conditions, including the impact of the economic recession on customer travel behavior; actual or threatened terrorist attacks, global instability and potential U.S. military actions or activities; external conditions, including air traffic congestion, weather and outbreak of disease; restriction on third-party membership programs; air travel substitutes; labor disputes, employee strikes and other labor-related disruptions, including in connection with our current negotiations with the union representing our flight attendants; aircraft-related fixed obligations; dependence on cash balances and operating cash flows; our aircraft utilization rate; maintenance costs; lack of marketing alliances; government regulation; our ability to fulfill growth strategy; our reliance on automated systems and the risks associated with changes made to those systems; use of personal data; ability to generate non-ticket revenues; operational disruptions; our reliance on third-party vendors and partners; our reliance on a single fuel provider; an aircraft accident or incident; negative publicity regarding our customer service; our aircraft and engine suppliers; changes in the U.S., Caribbean, and Latin America markets; insurance costs; environmental regulations; ability to attract and retain qualified personnel; loss of key personnel; and other risk factors included under “Risk Factors” in this annual report. We undertake no obligation to revise or update any forward-looking statements to reflect any event or circumstance that arises after the date of this report, or to confirm such statements to actual results or changes in our expectations. References in this report to “Spirit,” “we,” “us,” “our,” or the “Company” shall mean Spirit Airlines, Inc., unless the context indicates otherwise.

ITEM 1.    BUSINESS

Overview

Spirit Airlines is an ultra low-cost, low-fare airline based in Miramar, Florida that offers affordable travel to price-conscious customers. Our all-Airbus fleet currently operates more than 200 daily flights to over 50 destinations in the United States, Caribbean and Latin America. We completed an initial public offering during the second quarter of 2011, and our stock trades on the NASDAQ Global Select Stock Market under the symbol "SAVE".

Our ultra low-cost carrier, or ULCC, business model allows us to compete principally through offering low base fares and charging separately for select optional services, thereby allowing customers the freedom to save by choosing only the extras they value. We have unbundled components of our air travel service that have traditionally been included in base fares, such as baggage and advance seat selection, and offer them as optional, ancillary services (which we record in our financial statements as non-ticket revenue) as part of a strategy to enable our passengers to identify, select and pay only for the services they want to use.

Our History and Corporate Information

We were founded in 1964 as Clippert Trucking Company, a Michigan corporation. We began air charter operations in 1990 and renamed ourselves Spirit Airlines, Inc. in 1992. In 1994, we reincorporated in Delaware, and in 1999 we relocated our headquarters to Miramar, Florida. On June 1, 2011, we completed our initial public offering of common stock. For more information, see "Notes to Financial Statements- 18. Initial Public Offering and Tax Receivable Agreement".

Our mailing address and executive offices are located at 2800 Executive Way, Miramar, Florida 33025, and our telephone number at that address is (954) 447-7920. We are subject to the information and periodic reporting requirements of the Securities Exchange Act of 1934, or Exchange Act, and, in accordance therewith, file periodic reports, proxy statements and other information with the Securities and Exchange Commission, or SEC. Such periodic reports, proxy statements and other information are available for inspection and copying at the SEC's Public Reference Room at 100 F Street, NE., Washington,

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DC 20549 or may be obtained by calling the SEC at 1-800-SEC-0330. In addition, the SEC maintains a Web site at http://www.sec.gov that contains reports, proxy statements and other information regarding issuers that file electronically with the SEC. We also post on the Investor Relations page of our Web site, www.spirit.com, a link to our filings with the SEC, our Corporate Governance Guidelines and Code of Business Conduct and Ethics, which applies to all directors and all our employees, and the charters of our Audit, Compensation, Finance and Nominating and Corporate Governance committees. Our filings with the SEC are posted as soon as reasonably practical after they are filed electronically with the SEC. Please note that information contained on our Web site is not incorporated by reference in, or considered to be a part of, this report. You can also obtain copies of these documents free of charge by writing to us at: Corporate Secretary, Spirit Airlines, Inc., 2800 Executive Way, Miramar, Florida 33025, or emailing us at: Corporate.Secretary@spirit.com.

Our Business Model

Our ULCC business model provides customers very low base fares with a range of optional services, allowing customers the freedom to choose only the extras they value. The success of our model is driven by our low cost structure, which permits us to offer very low base fares while maintaining one of the highest profit margins in the industry.

We are focused on price-sensitive travelers who pay for their own travel, and our business model is designed to deliver what we believe our customers want: low fares. We aggressively use low fares to stimulate air travel demand in order to increase passenger volume, load factors and non-ticket revenue on the flights we operate. Higher passenger volumes and load factors help us sell more ancillary products and services, which in turn allows us to reduce the base fare we offer even further, stimulating additional demand. We strive to be recognized by our customers and potential customers as the low-fare leader in the markets we serve.

We compete based on total price. We believe other airlines have used an all-inclusive price concept to effectively raise total prices to consumers, rather than lowering fares by unbundling each product or service. For example, carriers that tout “free bags” have included the cost of checking bags in the total ticket price, not allowing passengers to see how much they would save if they did not check luggage. We believe that we and our customers benefit when we allow our customers to know the total price of their travel by breaking out the cost of additional, optional products or services. Before they pay, our customers are easily able to compare the total cost of flying with us versus flying with another airline.

We allow our customers to see all available options and their prices prior to purchasing a ticket, and this full transparency illustrates that our total prices are lower, on average, than our competitors, even when options are included.

Our Strengths

We believe we compete successfully in the airline industry by leveraging the following demonstrated business strengths:

Ultra-Low Cost Structure. Our unit operating costs are among the lowest of all airlines operating in the Americas. We believe this cost advantage helps protect our market position and enables us to offer some of the lowest base fares in our markets, sustain among the highest operating margins in our industry, and support continued growth. Our operating costs per available seat mile (CASM) of 10.09 cents in 2012, are significantly lower than those of the major domestic network carriers, American Airlines, Delta Air Lines, United Air Lines and US Airways, and among the lowest of the domestic low-cost carriers, including JetBlue Airways and Southwest Airlines. We achieve these low unit operating costs in large part due to:

• high aircraft utilization;

• high-density seating configurations on our aircraft;

• our simple operations;

• no hub-and-spoke inefficiencies ;

• highly productive workforce;

• opportunistic outsourcing of operating functions;

• operating a modern single fleet type of Airbus A320-family aircraft, with associated lower maintenance costs and common flight crews across the fleet;

• reduced sales, marketing and distribution costs through direct-to-consumer marketing;

• efficient flight scheduling, including minimal ground times between flights; and

• a company-wide business culture that is keenly focused on driving costs lower.

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Innovative Revenue Generation. We execute our innovative, unbundled pricing strategy to produce significant non-ticket revenue generation, which allows us to stimulate passenger demand for our product by lowering base fares and enabling passengers to identify, select, and pay for the products and services they want to use. Our unbundled strategy has enabled us to grow average non-ticket revenue per passenger flight segment from approximately $5 in 2006 to $51 in 2012 by:

• charging for checked and carry-on baggage;

• passing through all distribution-related expenses;

• charging for premium seats and advance seat selection;

• enforcing ticketing policies, including service charges for changes and cancellations;

• generating subscription revenue from our $9 Fare Club ultra low-fare subscription service;

• deriving brand-based revenues from proprietary services, such as our FREE SPIRIT affinity credit card program;

• selling itinerary attachments, such as hotel and car rental reservations and travel insurance, through our website; and

• selling in-flight products and onboard advertising.

Resilient Business Model and Customer Base. By focusing on price-sensitive travelers, we have maintained relatively stable unit revenue and profitability during volatile economic periods because we are not highly dependent on premium-fare business traffic. We believe our growing customer base is more resilient than the customer bases of most other airlines because our low fares and unbundled service offering appeal to price-sensitive passengers. For example, in 2009, when premium-fare business traffic dried up due to the economic recession, our operating revenue per available seat mile (RASM) declined 1.9%, compared to an average U.S. airline industry decline of over 9%.

Well Positioned for Growth. We have developed a substantial network of destinations in profitable U.S. domestic niche markets, targeted growth markets in the Caribbean and Latin America, and high-volume routes flown by price-sensitive travelers. In the United States, we also have grown into large markets that, due to higher fares, have priced out those more price-sensitive travelers. Our strategy to balance growth in large domestic markets, niche markets and opportunities in the Caribbean and Latin America gives us a significant number of growth opportunities.

Experienced International Operator. We believe we have substantial experience in foreign local aviation, security and customs regulations, local ground operations and flight crew training required for successful international and overwater flight operations. All of our aircraft are certified for overwater operations. We believe we compete favorably against other low-cost carriers because we have been conducting international flight operations since 2003 and have developed substantial experience in complying with the various regulations and business practices in the international markets we serve.

Financial Strength Achieved by Cost Discipline Focus. We believe our ULCC business model has delivered strong financial results in difficult economic times. We have generated these results by:

• keeping a consistent focus on maintaining low unit operating costs;

• maintaining disciplined capacity control and fleet size;

• ensuring our sourcing arrangements with key third parties are continually benchmarked against the best industry standards;

• maintaining a simple operation that focuses on delivering transportation; and

• generating and maintaining an adequate level of liquidity to insulate against volatility in key cost inputs, such as fuel, and in passenger demand that may occur as a result of changing general economic conditions.

Route Network

As of December 31, 2012, our route network included 110 markets served by 52 airports throughout North America, Central America, South America and the Caribbean.

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Below is a route map of our current network, which includes seasonal routes and routes announced as of January 31, 2013 for which service has not yet started:

Our network expansion targets underserved and/or overpriced markets. We utilize a rigorous process to identify growth opportunities to deploy new aircraft where we believe they will be profitable. To monitor the profitability of each route, we analyze weekly and monthly profitability reports as well as near term forecasting.

Competition

The airline industry is highly competitive. The principal competitive factors in the airline industry are fare pricing, total price, flight schedules, aircraft type, passenger amenities, number of routes served from a city, customer service, safety record and reputation, code-sharing relationships, and frequent flier programs and redemption opportunities. Our competitors and potential competitors include traditional network airlines, low-cost carriers, and regional airlines. We typically compete in markets served by traditional network airlines and other low-cost carriers, and, to a lesser extent, regional airlines.

Our single largest overlap, at approximately 60% of our markets as of January 8, 2013, is with American Airlines. Our principal competitors on domestic routes are American Airlines, Southwest Airlines, United Airlines, and Delta Airlines. Our principal competitors for service from South Florida to our markets in the Caribbean and Latin America are American Airlines through its hub in Miami and JetBlue Airways through its operations in Fort Lauderdale. Our principal competitive advantages are our low base fares and our focus on the price-sensitive traveler who pays his or her own travel costs. These low base fares are facilitated by our low unit operating costs, which in 2012 were among the lowest in the industry. We believe our low costs coupled with our non-ticket revenues allow us to price our fares at levels where we can be profitable while our primary competitors cannot.

The airline industry is particularly susceptible to price discounting because, once a flight is scheduled, airlines incur only nominal incremental costs to provide service to passengers occupying otherwise unsold seats. The expenses of a scheduled aircraft flight do not vary significantly with the number of passengers carried and, as a result, a relatively small change in the number of passengers or in pricing could have a disproportionate effect on an airline’s operating and financial results. Price competition occurs on a market-by-market basis through price discounts, changes in pricing structures, fare matching, target promotions and frequent flier initiatives. Airlines typically use discount fares and other promotions to stimulate traffic during normally slower travel periods to generate cash flow and to maximize RASM. The prevalence of discount fares can be particularly acute when a competitor has excess capacity that it is under financial pressure to sell. A key element to our competitive strategy is to maintain very low unit costs in order to permit us to compete successfully in price-sensitive markets.

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Seasonality

Our business is subject to significant seasonal fluctuations. We generally expect demand to be greater in the second and third quarters compared to the rest of the year. The air transportation business is also volatile and highly affected by economic cycles and trends.

Distribution

The majority of our tickets are sold through direct channels including online via www.spirit.com, our call center and the ticket counter with spirit.com being the primary channel. We also partner with a number of third parties to distribute our tickets, including online and traditional travel agents and electronic global distribution systems.

Customers

The majority of our customers travel for leisure (non-business) purposes, and leisure travel is discretionary and tends to be more price sensitive. By focusing on lowering our cost structure, we can successfully sell tickets at low fares while maintaining a strong profit margin.

Customer Service

We are committed to taking care of our customers. We believe focus on customer service in every aspect of our operations including personnel, flight equipment, in-flight and ancillary amenities, on-time performance, flight completion ratios, and baggage handling will strengthen customer loyalty and attract new customers. We proactively aim to improve our operations to ensure further improvement in customer service.

In response to customer and other demands, we recently modified our online booking process to allow our customers to see all available options and their prices prior to purchasing a ticket, and have initiated a campaign that illustrates our total prices are lower, on average, than our competitors, even when options are included.

Fleet

We fly only Airbus A320 family aircraft, which provides us significant operational and cost advantages compared to airlines that operate multiple aircraft types. By operating a single aircraft type, we avoid the incremental costs of training crews across multiple types. Flight crews are entirely interchangeable across all of our aircraft, and maintenance, spare parts inventories and other operational support remains highly simplified compared to those of more complex fleets. Due to this commonality among Airbus single-aisle aircraft, we can retain the benefits of a fleet comprised of a single type of aircraft while still having the flexibility to match the capacity and range of the aircraft to the demands of each route.

As of December 31, 2012, we had a fleet of 45 Airbus single-aisle aircraft, consisting of 27 A319s, 16 A320s and two A321s, and the average age of the fleet was 4.6 years. All of our existing aircraft were financed under operating leases.

As of December 31, 2012, firm aircraft orders with Airbus and a third party consisted of 106 A320 family aircraft (two used A319 aircraft, 54 of the existing A320 aircraft model, and 50 A320 NEOs). Aircraft are scheduled for delivery from 2013 through 2021. We also have a contractual purchase commitment for three spare V2500 IAE International Aero Engines AG engines scheduled for delivery from 2013 through 2015. The aircraft provide for growth capacity as well as give us flexibility in our fleet plan to replace all or some of the 31 aircraft in our present fleet with lease expirations between 2016 and 2020. We may elect to supplement these deliveries by additional acquisitions from the manufacturer or in the open market if demand conditions merit.

Consistent with our ULCC business model, each of our aircraft is configured with a high density seating configuration. Our A319s accommodate 145 passengers (compared to 120 on United and 124 on US Airways), our A320s accommodate 178 passengers (compared to 138 or 144 on United and 150 on JetBlue and US Airways) and our A321s accommodate 218 passengers (compared to 183 on US Airways).

Maintenance and Repairs

We have an FAA mandated and approved maintenance program, which is administered by our technical services department. Our maintenance technicians undergo extensive initial and ongoing training to ensure the safety of our aircraft.

Aircraft maintenance and repair consists of routine and non-routine maintenance and work performed is divided into three general categories: line maintenance, heavy maintenance and component service. Line maintenance consists of routine daily and weekly scheduled maintenance checks on our aircraft, including pre-flight, daily, weekly and overnight checks and

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any diagnostics and routine repairs and any unscheduled items on an as needed basis. Line maintenance events are currently serviced by in-house mechanics supplemented by contract labor and are primarily completed at airports we currently serve. Heavy airframe maintenance checks consist of a series of more complex tasks that can take from one to four weeks to accomplish and typically are required approximately every 20 months. Heavy engine maintenance is performed approximately every four to six years and includes a more complex scope of work. Due to our relatively small fleet size and projected fleet growth, we believe outsourcing all of our heavy maintenance activity, such as engine servicing, major part repair and component service repairs is more economical. Outsourcing eliminates the substantial initial capital requirements inherent in heavy aircraft maintenance. We have entered into a long-term flight hour agreement with IAE for our engine overhaul services and Lufthansa Technik on an hour-by-hour basis for component services. We outsource our heavy airframe maintenance to FAA-qualified maintenance providers.

Our recent maintenance expenses have been lower than what we expect to incur in the future because of the relatively young age of our aircraft fleet. Our maintenance costs are expected to increase as the scope of repairs increases with the increasing age of our fleet. As our aircraft age, scheduled scope of work and frequency of unscheduled maintenance events is likely to increase like any mature fleet. Our aircraft utilization rate could decrease with the increase in aircraft maintenance.

Employees

Our business is labor intensive, with labor costs representing approximately 19.1%, 19.6% and 22.0% of our total operating costs for 2012, 2011 and 2010, respectively. As of December 31, 2012, we had 680 pilots, 933 flight attendants, 24 flight dispatchers, 269 mechanics, 795 airport agents/other, and 332 employees in administrative roles for a total of 3,033 employees. Approximately 54% of our employees were represented by labor unions under three different collective-bargaining agreements. On an average full-time equivalent basis, for the full year 2012, we had 2,767 employees, compared to 2,456 in 2011.

FAA regulations require pilots to have commercial licenses with specific ratings for the aircraft to be flown, and to be medically certified as physically fit to fly. FAA and medical certifications are subject to periodic renewal requirements including recurrent training and recent flying experience. In December 2007, federal legislation was enacted increasing the mandatory retirement age for U.S. commercial airline pilots from age 60 to age 65. Mechanics, quality-control inspectors, and flight dispatchers must be certificated and qualified for specific aircraft. Flight attendants must have initial and periodic competency training and qualification. Training programs are subject to approval and monitoring by the FAA. Management personnel directly involved in the supervision of flight operations, training, maintenance, and aircraft inspection must also meet experience standards prescribed by FAA regulations. All safety-sensitive employees are subject to pre-employment, random, and post-accident drug testing.

The Railway Labor Act, or RLA, governs our relations with labor organizations. Under the RLA, the collective bargaining agreements generally do not expire, but instead become amendable as of a stated date. If either party wishes to modify the terms of any such agreement, they must notify the other party in the manner agreed to by the parties. Under the RLA, after receipt of such notice, the parties must meet for direct negotiations, and if no agreement is reached, either party may request the National Mediation Board, or NMB, to appoint a federal mediator. The RLA prescribes no set timetable for the direct negotiation and mediation process. It is not unusual for those processes to last for many months, and even for a few years. If no agreement is reached in mediation, the NMB in its discretion may declare at some time that an impasse exists, and if an impasse is declared, the NMB proffers binding arbitration to the parties. Either party may decline to submit to arbitration. If arbitration is rejected by either party, a 30-day “cooling off” period commences. During that period (or after), a Presidential Emergency Board, or PEB, may be established, which examines the parties’ positions and recommends a solution. The PEB process lasts for 30 days and is followed by another “cooling off” period of 30 days. At the end of a “cooling off” period, unless an agreement is reached or action is taken by Congress, the labor organization and the airline each may resort to “self-help,” including, for the labor organization, a strike or other labor action, and for the airline, the imposition of any or all of its proposed amendments and the hiring of new employees to replace any striking workers. Congress and the President have the authority to prevent “self-help” by enacting legislation that, among other things, imposes a settlement on the parties. The table below sets forth our employee groups and status of the collective bargaining agreements.

Employee Groups	Representative	Amendable Date
Pilots	Air Line Pilots Association, International (ALPA)	August 2015
Flight Attendants	Association of Flight Attendants (AFA-CWA)	August 2007
Dispatchers	Transport Workers Union (TWU)	July 2012

We focus on hiring highly productive employees and, where feasible, designing systems and processes around automation and outsourcing in order to maintain our low cost base.

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Safety and Security

We are committed to the safety and security of our passengers and employees. We strive to comply with or exceed health and safety regulation standards. In pursuing these goals, we maintain an active aviation safety program and all of our personnel are expected to participate in the program and take an active role in the identification, reduction, and elimination of hazards.

Our ongoing focus on safety relies on training our employees to proper standards and providing them with the tools and equipment they require so they can perform their job functions in a safe and efficient manner. Safety in the workplace targets several areas of our operation including: flight operations, maintenance, in-flight, dispatch, and station operations. The Transportation Security Administration, or TSA, is charged with aviation security for both airlines and airports. We maintain active, open lines of communication with the TSA at all of our locations to ensure proper standards for security of our personnel, customers, equipment and facilities are exercised throughout the operation.

Insurance

We maintain insurance policies we believe are customary in the airline industry and as required by the DOT. The policies principally provide liability coverage for public and passenger injury; damage to property; loss of or damage to flight equipment; fire and extended coverage; directors’ and officers’ liability; advertiser and media liability; cyber risk liability; fiduciary; and workers’ compensation and employer’s liability. We have obtained third-party war risk (terrorism) insurance through a special program administered by the FAA, resulting in lower premiums than if we had obtained this insurance in the commercial insurance market. Should the government discontinue this coverage, obtaining comparable coverage from commercial underwriters could result in substantially higher premiums and more restrictive terms, if it is available at all. Although we currently believe our insurance coverage is adequate, there can be no assurance that the amount of such coverage will not be changed or that we will not be forced to bear substantial losses from accidents.

Foreign Ownership

Under DOT regulations and federal law, we must be controlled by U.S. citizens. In order to qualify, at least 75% of our stock must be voted by U.S. citizens, and our president and at least two-thirds of our board of directors and senior management must be U.S. citizens.

On December 7, 2011, we entered into a Stock Distribution Agreement with Indigo Miramar LLC and its members. Pursuant to the Stock Distribution Agreement 10,576,180 shares of outstanding common stock were exchanged on a share-for-share basis for shares of non-voting common stock. As of February 11, 2013, we had no non-voting shares outstanding due to the conversion of all non-voting shares to voting shares in compliance with the Stock Distribution Agreement.

Government Regulation

Operational Regulation

The airline industry is heavily regulated, especially by the federal government. Two of the primary regulatory authorities overseeing air transportation in the United States are the DOT and the FAA. The DOT has jurisdiction over economic issues affecting air transportation, such as competition, route authorizations, advertising and sales practices, baggage liability and disabled passenger transportation, among other areas, several of which were included in new rules that became effective in 2011 and 2012 relating to, among other things, how airlines handle interactions with passengers through advertising, the reservation process, at the airport and on board the aircraft. The DOT has extended the effective date for certain of these rules. See “Risk Factors—Restrictions on or increased taxes applicable to charges for ancillary products and services paid by airline passengers and burdensome consumer protection regulations or laws could harm our business, results of operations and financial condition.” The DOT has a pending notice of proposed rulemaking addressing additional accommodations required for passengers with certain disabilities among other matters.

The DOT has authority to issue certificates of public convenience and necessity required for airlines to provide air transportation. We hold a DOT certificate of public convenience and necessity authorizing us to engage in scheduled air transportation of passengers, property, and mail within the United States, its territories and possessions and between the United States and all countries that maintain a liberal aviation trade relationship with the United States (known as “open skies” countries). We also hold DOT certificates to engage in air transportation to certain other countries with more restrictive aviation policies.

The FAA is responsible for regulating and overseeing matters relating to air carrier flight operations, including airline operating certificates, aircraft certification and maintenance and other matters affecting air safety. The FAA requires each commercial airline to obtain and hold an FAA air carrier certificate. This certificate, in combination with operations specifications issued to the airline by the FAA, authorizes the airline to operate at specific airports using aircraft approved by

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the FAA. As of December 31, 2012, we had FAA airworthiness certificates for all of our aircraft, we had obtained the necessary FAA authority to fly to all of the cities we currently serve and all of our aircraft had been certified for overwater operations. We believe we hold all necessary operating and airworthiness authorizations, certificates and licenses and are operating in compliance with applicable DOT and FAA regulations, interpretations and policies.

International Regulation

All international service is subject to the regulatory requirements of the foreign government involved. We currently operate international service to Aruba, the Bahamas, Colombia, Costa Rica, Dominican Republic, El Salvador, Guatemala, Haiti, Honduras, Jamaica, Mexico, Nicaragua, Panama, Peru and St. Maarten, as well as Puerto Rico and the U.S. Virgin Islands. If we decide to increase our routes to additional international destinations, we will be required to obtain necessary authority from the DOT and the applicable foreign government. We are also required to comply with overfly regulations in countries that lay along our routes but which we do not serve.

International service is also subject to Customs and Border Protection, or CBP, immigration and agriculture requirements, and the requirements of equivalent foreign governmental agencies. Like other airlines flying international routes, from time to time we may be subject to civil fines and penalties imposed by CBP if unmanifested or illegal cargo, such as illegal narcotics, is found on our aircraft. These fines and penalties, which in the case of narcotics are based upon the retail value of the seizure, may be substantial. We have implemented a comprehensive security program at our airports to reduce the risk of illegal cargo being placed on our aircraft, and we seek to cooperate actively with CBP and other U.S. and foreign law enforcement agencies in investigating incidents or attempts to introduce illegal cargo.

Security Regulation

The TSA was created in 2001 with the responsibility and authority to oversee the implementation, and ensure the adequacy, of security measures at airports and other transportation facilities. Funding for passenger security is provided in part by a per enplanement ticket tax (passenger security fee) of $2.50 per passenger flight segment, subject to a $5 per one-way trip cap. The TSA was granted authority to impose additional fees on air carriers if necessary to cover additional federal aviation security costs. Pursuant to its authority, the TSA may revise the way it assesses this fee, which could result in increased costs for passengers and us. We cannot forecast what additional security and safety requirements may be imposed in the future or the costs or revenue impact that would be associated with complying with such requirements. The TSA also assesses an Aviation Security Infrastructure Fee, or ASIF, on each airline. Our ASIF fee is approximately $1.6 million per year.

Environmental Regulation

We are subject to various federal, state and local laws and regulations relating to the protection of the environment and affecting matters such as aircraft engine emissions, aircraft noise emissions, and the discharge or disposal of materials and chemicals, which laws and regulations are administered by numerous state and federal agencies. The Environmental Protection Agency, or EPA, regulates operations, including air carrier operations, which affect the quality of air in the United States. We believe the aircraft in our fleet meet all emission standards issued by the EPA. Concern about climate change and greenhouse gases may result in additional regulation or taxation of aircraft emissions in the United States and abroad.

Federal law recognizes the right of airport operators with special noise problems to implement local noise abatement procedures so long as those procedures do not interfere unreasonably with interstate and foreign commerce and the national air transportation system. These restrictions can include limiting nighttime operations, directing specific aircraft operational procedures during takeoff and initial climb, and limiting the overall number of flights at an airport. None of the airports we serve currently restricts the number of flights or hours of operation, although it is possible one or more of such airports may do so in the future with or without advance notice.

Other Regulations

We are subject to certain provisions of the Communications Act of 1934, as amended, and are required to obtain an aeronautical radio license from the Federal Communications Commission, or FCC. To the extent we are subject to FCC requirements, we will take all necessary steps to comply with those requirements. We are also subject to state and local laws and regulations at locations where we operate and the regulations of various local authorities that operate the airports we serve.

Future Regulations

The U.S. and foreign governments may consider and adopt new laws, regulations, interpretations and policies regarding a wide variety of matters that could directly or indirectly affect our results of operations. We cannot predict what laws, regulations, interpretations and policies might be considered in the future, nor can we judge what impact, if any, the implementation of any of these proposals or changes might have on our business.

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ITEM 1A.    RISK FACTORS

You should carefully consider the risks described below and the other information in this report. If any of the following risks materialize, our business could be materially harmed, and our financial condition and results of operations could be materially and adversely affected. The risks described below are not the only ones facing us. Additional risks not currently known to us or that we currently believe are immaterial may also impair our business, results of operations, financial condition and liquidity.

Risks Related to Our Industry

We operate in an extremely competitive industry.

We face significant competition with respect to routes, fares and services. Within the airline industry, we compete with traditional network airlines, other low-cost airlines and regional airlines on many of our routes. Competition in most of the destinations we presently serve is intense, due to the large number of carriers in those markets. Furthermore, other airlines may begin service or increase existing service on routes where we currently face no or little competition. Substantially all of our competitors are larger and have significantly greater financial and other resources than we do.

The airline industry is particularly susceptible to price discounting because once a flight is scheduled, airlines incur only nominal additional costs to provide service to passengers occupying otherwise unsold seats. Increased fare or other price competition could adversely affect our operations. Moreover, many other airlines have begun to unbundle services by charging separately for services such as baggage and advance seat selection. This unbundling and other cost reducing measures could enable competitor airlines to reduce fares on routes that we serve.

In addition, airlines increase or decrease capacity in markets based on perceived profitability. Decisions by our competitors that increase overall industry capacity, or capacity dedicated to a particular domestic or foreign region, market or route, could have a material adverse impact on our business. If a traditional network airline were to successfully develop a low-cost structure or if we were to experience increased competition from other low-cost carriers, our business could be materially adversely affected.

All of the domestic traditional network airlines have on one or more occasions initiated bankruptcy proceedings in attempts to restructure their debt and other obligations and reduce their operating costs. On November 29, 2011, AMR Corporation and substantially all of its subsidiaries, including American Airlines, Inc., filed a petition for relief under Chapter 11 of the U.S. Bankruptcy Code. We presently compete with American Airlines in a majority of our markets. We cannot predict the extent to which the pendency of this bankruptcy proceeding will change our competitive dynamic with American Airlines or the extent to which a successfully reorganized American Airlines, or the acquisition of American Airlines by another carrier, will result in a more effective competitor to us.

Our growth and the success of our ULCC business model could stimulate competition in our markets through our competitors’ development of their own ULCC strategies or new market entrants. Any such competitor may have greater financial resources and access to cheaper sources of capital than we do, which could enable them to operate their business with a lower cost structure than we can. If these competitors adopt and successfully execute a ULCC business model, we could be materially adversely affected.

There have been numerous mergers and acquisitions within the airline industry including, for example, the recent combinations of Delta Air Lines and Northwest Airlines, United Airlines and Continental Airlines, and Southwest Airlines and AirTran Airways. In the future, there may be additional mergers and acquisitions in our industry. Any business combination could significantly alter industry conditions and competition within the airline industry and could cause fares of our competitors to be reduced.

The extremely competitive nature of the airline industry could prevent us from attaining the level of passenger traffic or maintaining the level of fares or revenues related to ancillary services required to sustain profitable operations in new and existing markets and could impede our growth strategy, which could harm our operating results. Due to our relatively small size, we are susceptible to a fare war or other competitive activities in one or more of the markets we serve, which could have a material adverse effect on our business, results of operations, and financial condition.

Our low cost structure is one of our primary competitive advantages, and many factors could affect our ability to control our costs.

Our low cost structure is one of our primary competitive advantages. However, we have limited control over many of our costs. For example, we have limited control over the price and availability of aircraft fuel, aviation insurance, airport and

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related infrastructure taxes, the cost of meeting changing regulatory requirements, and our cost to access capital or financing. In addition, the compensation and benefit costs applicable to a significant portion of our employees are established by the terms of our collective bargaining agreements. We cannot guarantee we will be able to maintain a cost advantage over our competitors. If our cost structure increases and we are no longer able to maintain a cost advantage over our competitors, it could have a material adverse effect on our business, results of operations and financial condition.

The airline industry is heavily impacted by the price and availability of aircraft fuel. Continued volatility in fuel costs or significant disruptions in the supply of fuel, including hurricanes and other events affecting the Gulf Coast in particular, could materially adversely affect our business, results of operations, and financial condition.

Aircraft fuel costs represent our single largest operating cost, accounting for 41.2%, 41.9%, and 34.8% of our total operating expenses for 2012, 2011 and 2010, respectively. As such, our operating results are significantly affected by changes in the availability and the cost of aircraft fuel, especially aircraft fuel refined in the U.S. Gulf Coast region, on which we are highly dependent. Both the cost and the availability of aircraft fuel are subject to many meteorological, economic, and political factors and events occurring throughout the world, which we can neither control nor accurately predict. For example, a major hurricane making landfall along the Gulf Coast could cause disruption to oil production, refinery operations, and pipeline capacity in that region, possibly resulting in significant increases in the price of aircraft fuel and diminished availability of aircraft fuel supplies. Any disruption to oil production, refinery operations, or pipeline capacity in the Gulf Coast region could have a disproportionate impact on our operating results compared to other airlines that have more diversified fuel sources.

Aircraft fuel prices have been subject to high volatility, fluctuating substantially over the past several years. Due to the large proportion of aircraft fuel costs in our total operating cost base, even a relatively small increase in the price of aircraft fuel can have a significant negative impact on our operating costs and on our business, results of operations and financial condition.

Our fuel hedging strategy may not reduce our fuel costs.

We enter into fuel derivative contracts in order to mitigate the risk to our business from future volatility in fuel prices. As of December 31, 2012, we had fuel hedges using U.S. Gulf Coast jet fuel collars in place for approximately 5% of our 2013 anticipated fuel consumption. Additionally, during peak hurricane season (August through October), we may enter into jet fuel swaps to protect the refining price risk between the price of crude oil and the price of refined jet fuel. There can be no assurance that we will be able to enter into fuel hedge contracts in the future. Our liquidity and general level of capital resources impacts our ability to hedge our fuel requirements. Even if we are able to hedge portions of our future fuel requirements, we cannot guarantee that our hedge contracts will provide sufficient protection against increased fuel costs or that our counterparties will be able to perform under our hedge contracts, such as in the case of a counterparty’s insolvency. Furthermore, our ability to react to the cost of fuel, absent hedging, is limited because we set the price of tickets in advance of incurring fuel costs. Our ability to pass on any significant increases in aircraft fuel costs through fare increases could also be limited. Finally, it is currently unknown what impact the Dodd-Frank Wall Street Reform and Consumer Protection Act will have on collateral and margin requirements for fuel hedging, which could significantly impair our ability to hedge our fuel costs. As of December 31, 2012, the fair value of our fuel derivative contracts was an asset of $0.3 million. In the event of a reduction in fuel prices compared to our hedged position, our hedged positions could counteract the cost benefit of lower fuel prices and could require us to post additional cash margin collateral. Please see “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Trends and Uncertainties Affecting Our Business—Aircraft Fuel.”

Restrictions on or increased taxes applicable to charges for ancillary products and services paid by airline passengers and burdensome consumer protection regulations or laws could harm our business, results of operations, and financial condition.

During 2012, 2011 and 2010, we generated non-ticket revenues of $535.6 million, $381.5 million and $243.3 million, respectively. Our non-ticket revenues are generated from charges for, among other things, baggage, bookings through our distribution channels, advance seat selection, itinerary changes and loyalty programs. In April 2011, the DOT published a broad set of final rules relating to, among other things, how airlines handle interactions with passengers through advertising, the reservations process, at the airport and on board the aircraft. The final rules require airlines to publish a full fare for a flight, including mandatory taxes and fees, and to enhance disclosure of the cost of optional products and services, including baggage charges. The rules restrict airlines from increasing ticket prices post-purchase (other than increases resulting from changes in government-imposed fees or taxes) or increase significantly the amount and scope of compensation payable to passengers involuntarily denied boarding due to oversales. The final rules also extend the applicability of tarmac delay reporting and penalties to include international flights and provide that reservations made more than one week prior to flight date may be held at the quoted fare without payment, or cancelled without penalty, for 24 hours. All of these new rules became effective by January 24, 2012. If we are not able to remain in compliance with these rules, the DOT may subject us to fines or other enforcement action, including requirements to modify our passenger reservations system, which could have a material adverse

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effect on our business. Moreover, we cannot assure you that compliance with these rules will not have a material adverse effect on our business. In addition, the U.S. Congress and Federal administrative agencies have investigated the increasingly common airline industry practice of unbundling the pricing of certain products and services. If new taxes are imposed on non-ticket revenues, or if other laws or regulations are adopted that make unbundling of airline products and services impermissible, or more cumbersome or expensive, our business, results of operations, and financial condition could be harmed. Congressional and other government scrutiny may also change industry practice or public willingness to pay for ancillary services. See also “—We are subject to extensive regulation by the Federal Aviation Administration, the Department of Transportation, and other U.S. and foreign governmental agencies, compliance with which could cause us to incur increased costs and adversely affect our business and financial results.”

The airline industry is particularly sensitive to changes in economic conditions. Continued adverse economic conditions or a reoccurrence of such conditions would negatively impact our business, results of operations and financial condition.

Our business and the airline industry in general are affected by many changing economic conditions beyond our control, including, among others:

• changes and volatility in general economic conditions, including the severity and duration of any downturn in the U.S. or global economy and financial markets;

• changes in consumer preferences, perceptions, spending patterns or demographic trends, including any increased preference for higher-fare carriers offering higher amenity levels, and reduced preferences for low-fare carriers offering more basic transportation, during better economic times;

• higher levels of unemployment and varying levels of disposable or discretionary income;

• depressed housing and stock market prices; and

• lower levels of actual or perceived consumer confidence.

These factors can adversely affect, and from time to time have adversely affected, our results of operations, our ability to obtain financing on acceptable terms and our liquidity. Unfavorable general economic conditions, such as higher unemployment rates, a constrained credit market, housing-related pressures and increased focus on reducing business operating costs can reduce spending for price-sensitive leisure and business travel. For many travelers, in particular the price-sensitive travelers we serve, air transportation is a discretionary purchase that they may reduce or eliminate from their spending in difficult economic times. The overall decrease in demand for air transportation in the United States in 2008 and 2009 resulting from record high fuel prices and the economic recession required that we take significant steps to reduce our capacity, which reduced our revenues. Unfavorable economic conditions could also affect our ability to raise prices to counteract increased fuel, labor or other costs, resulting in a material adverse effect on our business, results of operations, and financial condition.

The airline industry faces ongoing security concerns and related cost burdens, further threatened or actual terrorist attacks, or other hostilities that could significantly harm our industry and our business.

The terrorist attacks of September 11, 2001 and their aftermath negatively affected the airline industry. The primary effects experienced by the airline industry included:

• substantial loss of revenue and flight disruption costs caused by the grounding of all commercial air traffic in or headed to the United States by the Federal Aviation Administration, or FAA, for about three days after the terrorist attacks;

• increased security and insurance costs;

• increased concerns about future terrorist attacks;

• airport shutdowns and flight cancellations and delays due to security breaches and perceived safety threats; and

• significantly reduced passenger traffic and yields due to the subsequent dramatic drop in demand for air travel.

Since September 11, 2001, the Department of Homeland Security and the Transportation Security Administration, or TSA, have implemented numerous security measures that restrict airline operations and increase costs, and are likely to implement additional measures in the future. For example, following the widely publicized attempt of an alleged terrorist to detonate plastic explosives hidden underneath his clothes on a Northwest Airlines flight on Christmas Day in 2009, passengers became subject to enhanced random screening, which may include pat-downs, explosive detection testing or body scans. Enhanced passenger screening, increased regulation governing carry-on baggage and other similar restrictions on passenger

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travel may further increase passenger inconvenience and reduce the demand for air travel. In addition, increased or enhanced security measures have tended to result in higher governmental fees imposed on airlines, resulting in higher operating costs for airlines, which we may not be able to pass on to consumers in the form of higher prices. Any future terrorist attacks or attempted attacks, even if not made directly on the airline industry, or the fear of such attacks or other hostilities (including elevated national threat warnings or selective cancellation or redirection of flights due to terror threats) would likely have a material adverse effect on our business, results of operations and financial condition, and on the airline industry in general.

Airlines are often affected by factors beyond their control including: air traffic congestion at airports; air traffic control inefficiencies; adverse weather conditions, such as hurricanes or blizzards; increased security measures; new travel related taxes or the outbreak of disease, any of which could harm our business, operating results, and financial condition.

Like other airlines, we are subject to delays caused by factors beyond our control, including air traffic congestion at airports, air traffic control inefficiencies, adverse weather conditions, increased security measures, new travel related taxes and the outbreak of disease. Delays frustrate passengers and increase costs, which in turn could adversely affect profitability. The federal government singularly controls all U.S. airspace, and airlines are completely dependent on the FAA to operate that airspace in a safe, efficient, and affordable manner. The air traffic control system, which is operated by the FAA, faces challenges in managing the growing demand for U.S. air travel. U.S. and foreign air-traffic controllers often rely on outdated technologies that routinely overwhelm the system and compel airlines to fly inefficient, indirect routes resulting in delays. Adverse weather conditions and natural disasters, such as hurricanes affecting southern Florida and the Caribbean as well as other areas of the eastern United States (such as Hurricane Sandy in October 2012), winter snowstorms or the January 2010 earthquakes in Port-au-Prince, Haiti, can cause flight cancellations or significant delays. Cancellations or delays due to adverse weather conditions or natural disasters, air traffic control problems or inefficiencies, breaches in security or other factors could harm our business, results of operations and financial condition. Similarly, outbreaks of pandemic or contagious diseases, such as avian flu, severe acute respiratory syndrome (SARS) and H1N1 (swine) flu, could result in significant decreases in passenger traffic and the imposition of government restrictions in service and could have a material adverse impact on the airline industry. Increased travel taxes, such as those provided in the Travel Promotion Act, enacted March 10, 2010, which charges visitors from certain countries a $10 fee every two years to travel into the United States to subsidize certain travel promotion efforts, could also result in decreases in passenger traffic. Any general reduction in airline passenger traffic could have a material adverse effect on our business, results of operations and financial condition.

Restrictions on or litigation regarding third-party membership discount programs could harm our business, operating results and financial condition.

We generate a relatively small but growing portion of our revenue from order referral fees, revenue share and other fees paid to us by third-party merchants for customer click-throughs, distribution of third-party promotional materials and referrals arising from products and services of the third-party merchants that we offer to our customers on our website. Some of these third-party referral-based offers are for memberships in discount programs or similar promotions made to customers who have purchased products from us, and for which we receive a payment from the third-party merchants for every customer that accepts the promotion. Certain of these third-party membership discount programs have been the subject of consumer complaints, litigation and regulatory actions alleging that the enrollment and billing practices involved in the programs violate various consumer protection laws or are otherwise deceptive. Any private or governmental claim or action that may be brought against us in the future relating to these third-party membership programs could result in our being obligated to pay damages or incurring legal fees in defending claims. These damages and fees could be disproportionate to the revenues we generate through these relationships. In addition, customer dissatisfaction or a significant reduction in or termination of the third-party membership discount offers on our website as a result of these claims could have a negative impact on our brand, and have a material adverse effect on our business, results of operations and financial condition.

We face competition from air travel substitutes.

In addition to airline competition from traditional network airlines, other low-cost airlines and regional airlines, we also face competition from air travel substitutes. On our domestic routes, we face competition from some other transportation alternatives, such as bus, train or automobile. In addition, technology advancements may limit the demand for air travel. For example, video teleconferencing and other methods of electronic communication may reduce the need for in-person communication and add a new dimension of competition to the industry as travelers seek lower-cost substitutes for air travel. If we are unable to adjust rapidly in the event the basis of competition in our markets changes, it could have a material adverse effect on our business, results of operations and financial condition.

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Risks Related to Our Business

Increased labor costs, union disputes, employee strikes and other labor-related disruption may adversely affect our business, results of operations and financial conditions.

Our business is labor intensive, with labor costs representing approximately 19.1%, 19.6% and 22.0% of our total operating costs for 2012, 2011 and 2010, respectively. As of December 31, 2012, approximately 54% of our workforce was represented by labor unions and thereby covered by collective bargaining agreements. We cannot assure you that our labor costs going forward will remain competitive because in the future our labor agreements may be amended or become amendable and new agreements could have terms with higher labor costs; one or more of our competitors may significantly reduce their labor costs, thereby reducing or eliminating our comparative advantages as to one or more of such competitors; or our labor costs may increase in connection with our growth. We may also become subject to additional collective bargaining agreements in the future as non-unionized workers may unionize.

Relations between air carriers and labor unions in the United States are governed by the Railway Labor Act, or the RLA. Under the RLA, collective bargaining agreements generally contain “amendable dates” rather than expiration dates, and the RLA requires that a carrier maintain the existing terms and conditions of employment following the amendable date through a multi-stage and usually lengthy series of bargaining processes overseen by the National Mediation Board, or the NMB. This process continues until either the parties have reached agreement on a new collective bargaining agreement, or the parties have been released to “self-help” by the NMB. In most circumstances, the RLA prohibits strikes; however, after release by the NMB, carriers and unions are free to engage in self-help measures such as lockouts and strikes.

Our flight operations were shut down due to a strike by our pilots beginning on June 12, 2010 and lasting until we and the union representing our pilots reached a tentative agreement for a new contract. Under a Return to Work Agreement, we began to resume flights on June 17, 2010 and resumed our full flight schedule on June 18, 2010. On August 1, 2010, we and the pilots’ union executed a five-year collective bargaining agreement. This shutdown had a material adverse effect on our results of operations for 2010. Please see “Management’s Discussion and Analysis of Financial Condition and Results of Operations—June 2010 Pilot Strike.”

Our collective bargaining agreement with our flight attendants became amendable in August 2007, and we are currently engaged in negotiations with the union representing our flight attendants. Our collective bargaining agreement with our dispatchers became amendable in July 2012. The outcome of our pending collective bargaining negotiations cannot presently be determined and the terms and conditions of our future collective bargaining agreements may be affected by the results of collective bargaining negotiations at other airlines that may have a greater ability, due to larger scale, greater efficiency or other factors, to bear higher costs than we can. In addition, if we are unable to reach agreement with any of our unionized work groups in current or future negotiations regarding the terms of their collective bargaining agreements, we may be subject to work interruptions or stoppages. Any such action or other labor dispute with unionized employees could disrupt our operations, reduce our profitability, or interfere with the ability of our management to focus on executing our business strategies. Our business, results of operations and financial condition may be materially adversely affected based on the outcome of our negotiations with the union representing our flight attendants.

We have a significant amount of aircraft-related fixed obligations that could impair our liquidity and thereby harm our business, results of operations and financial condition.

The airline business is capital intensive and, as a result, many airline companies are highly leveraged. All of our aircraft are leased, and in 2012 and 2011 we paid the lessors rent of $140.8 million and $116.6 million, respectively, and maintenance deposits net of reimbursements of $31.6 million and $36.8 million, respectively. As of December 31, 2012, we had future operating lease obligations of approximately $1.2 billion. In addition, we have significant obligations for aircraft and spare engines that that we have ordered from Airbus and International Aero Engines AG, or IAE, (or any other engine manufacturer for future deliveries) for delivery over the next nine years. Our ability to pay the fixed costs associated with our contractual obligations will depend on our operating performance, cash flow, and our ability to secure adequate financing, which will in turn depend on, among other things, the success of our current business strategy, whether fuel prices continue at current price levels and/or further increase or decrease, further weakening or improving in the U.S. economy, as well as general economic and political conditions and other factors that are, to some extent, beyond our control. The amount of our aircraft related fixed obligations could have a material adverse effect on our business, results of operations and financial condition and could:

• require a substantial portion of cash flow from operations for operating lease and maintenance deposit payments, thereby reducing the availability of our cash flow to fund working capital, capital expenditures and other general corporate purposes;

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• limit our ability to make required pre-delivery deposit payment, or PDPs, including those payable to Airbus or IAE for our aircraft and spare engines on order;

• limit our ability to obtain additional financing to support our expansion plans and for working capital and other purposes on acceptable terms or at all;

• make it more difficult for us to pay our other obligations as they become due during adverse general economic and market industry conditions because any related decrease in revenues could cause us to not have sufficient cash flows from operations to make our scheduled payments;

• reduce our flexibility in planning for, or reacting to, changes in our business and the airline industry and, consequently, place us at a competitive disadvantage to our competitors with less fixed payment obligations; and

• cause us to lose access to one or more aircraft and forfeit our rent deposits if we are unable to make our required aircraft lease rental payments and our lessors exercise their remedies under the lease agreement including cross default provisions in certain of our leases.

A failure to pay our operating lease and other fixed cost obligations or a breach of our contractual obligations could result in a variety of adverse consequences, including the exercise of remedies by our creditors and lessors. In such a situation, it is unlikely that we would be able to cure our breach, fulfill our obligations, make required lease payments or otherwise cover our fixed costs, which would have a material adverse effect on our business, results of operations and financial condition.

We are highly dependent upon our cash balances and operating cash flows.

As of December 31, 2012, we had access to lines of credit from two counterparties to our jet fuel derivatives and our purchase credit card issuer aggregating $36.6 million. These credit facilities are not adequate to finance our operations, and we will continue to be dependent on our operating cash flows and cash balances to fund our operations and to make scheduled payments on our aircraft related fixed obligations. Although our credit card processors currently do not have a right to hold back credit card receipts to cover repayment to customers, if we fail to maintain certain liquidity and other financial covenants, their rights to holdback would be reinstated, which would result in a reduction of unrestricted cash that could be material. In addition, we are required by some of our aircraft lessors to fund reserves in cash in advance for scheduled maintenance, and a portion of our cash is therefore unavailable until after we have completed the scheduled maintenance in accordance with the terms of the operating leases. Based on the age of our fleet and our growth strategy, these maintenance deposits will increase over the next few years before we receive any significant reimbursement for completed maintenance. If we fail to generate sufficient funds from operations to meet our operating cash requirements or do not obtain a line of credit, other borrowing facility or equity financing, we could default on our operating lease and fixed obligations. Our inability to meet our obligations as they become due would have a material adverse effect on our business, results of operations, and financial condition.

A deterioration in worldwide economic conditions may adversely affect our business, operating results, financial condition, liquidity and ability to obtain financing or access capital markets.

The general worldwide economy has experienced a downturn due to the effects of the European debt crisis, unfavorable U.S. economic conditions and slowing growth in certain Asian economies, including general credit market crises, collateral effects on the finance and banking industries, concerns about inflation, slower economic activity, decreased consumer confidence, reduced corporate profits and capital spending, adverse business conditions and liquidity concerns. The airline industry is particularly sensitive to changes in economic conditions, which affect customer travel patterns and related revenues.  A weak economy could reduce our bookings, and a reduction in discretionary spending could also decrease amounts our customers are willing to pay.  Unfavorable economic conditions can also impact the ability of airlines to raise fares to help offset increased fuel, labor and other costs. We cannot accurately predict the effect or duration of any economic slowdown or the timing or strength of a subsequent economic recovery.

In addition, we have significant obligations for aircraft and spare engines that we have ordered from Airbus and IAE (or any other engine manufacturer for future deliveries) over the next nine years, and we will need to finance these purchases. We may not have sufficient liquidity or creditworthiness to fund the purchase of aircraft and engines, including payment of PDPs, or for other working capital. Factors that affect our ability to raise financing or access the capital markets include market conditions in the airline industry, economic conditions, the perceived residual value of aircraft and related assets, the level and volatility of our earnings, our relative competitive position in the markets in which we operate, our ability to retain key personnel, our operating cash flows, and legal and regulatory developments. Regardless of our creditworthiness, at times the market for aircraft purchase or lease financing has been very constrained due to such factors as the general state of the capital markets and the financial position of the major providers of commercial aircraft financing.

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Our liquidity and general level of capital resources impact our ability to hedge our fuel requirements.

As of December 31, 2012, we had fuel hedges using U.S. Gulf Coast jet fuel collars in place for approximately 5% of our 2013 anticipated fuel consumption. While we intend to hedge a portion of our future fuel requirements, there can be no assurance that, at any given time, we will be able to enter into fuel hedge contracts. In the past, we have not had and in the future we may not have sufficient creditworthiness or liquidity to post the collateral necessary to hedge our fuel requirements. Even if we are able to hedge portions of our future fuel requirements, we cannot guarantee that our hedge contracts will provide any particular level of protection against increased fuel costs or that our counterparties will be able to perform under our hedge contracts, such as in the case of a counterparty’s insolvency. Furthermore, our ability to react to the cost of fuel, absent hedging, is limited, because we set the price of tickets in advance of knowing our fuel costs at the time the tickets are flown. Our ability to pass on any significant increases in aircraft fuel costs through fare increases could also be limited.

We rely on maintaining a high daily aircraft utilization rate to implement our low cost structure, which makes us especially vulnerable to flight delays or cancellations or aircraft unavailability.

We maintain a high daily aircraft utilization rate. Our average daily aircraft utilization was 12.8 hours, 12.7 hours and 12.8 hours for 2012, 2011 and 2010, respectively. Aircraft utilization is the average amount of time per day that our aircraft spend carrying passengers. Our revenue per aircraft can be increased by high daily aircraft utilization, which is achieved in part by reducing turnaround times at airports, so we can fly more hours on average in a day. Aircraft utilization is reduced by delays and cancellations from various factors, many of which are beyond our control, including air traffic congestion at airports or other air traffic control problems, adverse weather conditions, increased security measures or breaches in security, international or domestic conflicts, terrorist activity, or other changes in business conditions. A significant portion of our operations are concentrated in markets such as South Florida, the Caribbean, Latin America and the Northeast and northern Midwest regions of the United States, which are particularly vulnerable to weather, airport traffic constraints and other delays. In addition, pulling aircraft out of service for unscheduled and scheduled maintenance, which will increase as our fleet ages, may materially reduce our average fleet utilization and require that we seek short-term substitute capacity at increased costs. Due to the relatively small size of our fleet and high daily aircraft utilization rate, the unavailability of one or more aircraft and resulting reduced capacity could have a material adverse effect on our business, results of operations, and financial condition.

Our maintenance costs will increase as our fleet ages, and we will periodically incur substantial maintenance costs due to the maintenance schedules of our aircraft fleet.

As of December 31, 2012, the average age of our aircraft was approximately 4.6 years. Our relatively new aircraft require less maintenance now than they will in the future. Our fleet will require more maintenance as it ages and our maintenance and repair expenses for each of our aircraft will be incurred at approximately the same intervals. Moreover, because our current fleet was acquired over a relatively short period, significant maintenance that is scheduled on each of these planes will occur at roughly the same time, meaning we will incur our most expensive scheduled maintenance obligations, known as heavy maintenance, across our present fleet around the same time. These more significant maintenance activities result in out-of-service periods during which our aircraft are dedicated to maintenance activities and unavailable to fly revenue service. In addition, the terms of some of our lease agreements require us to pay supplemental rent, also known as maintenance reserves, to the lessor in advance of the performance of major maintenance, resulting in our recording significant prepaid deposits on our balance sheet. We expect scheduled and unscheduled aircraft maintenance expenses to increase as a percentage of our revenue over the next several years. Any significant increase in maintenance and repair expenses would have a material adverse effect on our business, results of operations, and financial condition. Please see “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Critical Accounting Policies and Estimates—Aircraft Maintenance, Materials and Repair Costs and Heavy Maintenance Amortization” and “—Maintenance Reserves.”

Our lack of marketing alliances could harm our business.

Many airlines, including the domestic traditional network airlines (American, Delta, United and US Airways) have marketing alliances with other airlines, under which they market and advertise their status as marketing alliance partners. These alliances, such as OneWorld, SkyTeam and Star Alliance, generally provide for code-sharing, frequent flier program reciprocity, coordinated scheduling of flights to permit convenient connections and other joint marketing activities. Such arrangements permit an airline to market flights operated by other alliance members as its own. This increases the destinations, connections and frequencies offered by the airline and provides an opportunity to increase traffic on that airline’s segment of flights connecting with alliance partners. We currently do not have any alliances with U.S. or foreign airlines. Our lack of marketing alliances puts us at a competitive disadvantage to traditional network carriers who are able to attract passengers through more widespread alliances, particularly on international routes, and that disadvantage may result in a material adverse effect on our passenger traffic, business, results of operations and financial condition.

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We are subject to extensive and increasing regulation by the Federal Aviation Administration, the Department of Transportation, and other U.S. and foreign governmental agencies, compliance with which could cause us to incur increased costs and adversely affect our business and financial results.

Airlines are subject to extensive and increasing regulatory and legal compliance requirements, both domestically and internationally, that involve significant costs. In the last several years, Congress has passed laws, and the DOT, FAA and TSA have issued regulations, relating to the operation of airlines that have required significant expenditures. We expect to continue to incur expenses in connection with complying with government regulations. Additional laws, regulations, taxes and increased airport rates and charges have been proposed from time to time that could significantly increase the cost of airline operations or reduce the demand for air travel. If adopted, these measures could have the effect of raising ticket prices, reducing revenue and increasing costs. For example, the DOT finalized rules, effective on April 29, 2010, requiring new procedures for customer handling during long onboard tarmac delays, as well as additional reporting requirements for airlines that could increase the cost of airline operations or reduce revenues. The DOT has been aggressively investigating alleged violations of the new rules. In addition, a second set of DOT final rules, which became effective in August 2011 and January 2012, addresses, among other things, concerns about how airlines handle interactions with passengers through advertising, the reservations process, at the airport and on board the aircraft, including requirements for disclosure of base fares plus a set of regulatorily dictated options and limits on cancellations and service charges for changes and cancellations. Failure to remain in full compliance with these rules may subject us to fines or other enforcement action, including requirements to modify our passenger reservations system, which could have a material effect on our business. The DOT has a pending notice of proposed rulemaking addressing additional accommodations required for passengers with certain disabilities and on December 21, 2011 announced a new final rule related to flight crew duty and rest requirements. We cannot assure you that compliance with these new rules will not have a material adverse effect on our business.

On August 3, 2010, the Airline Baggage Transparency and Accountability Act was introduced in the United States Senate. This legislation, if enacted, would increase disclosure regarding fees for airline ticket sales, impose federal taxes on charges for carry-on and checked baggage, authorize the DOT’s Aviation Consumer Protection Division to oversee lost and stolen baggage claims, and require data collection and the public release of collected data concerning airline handling of lost, damaged and stolen luggage. More recently, the United States Senate passed an amendment to the FAA reauthorization bill that, if enacted, would impose federal taxes at a rate of 7.5% on charges for carry-on baggage. If the Airline Baggage Transparency and Accountability Act, the Senate amendment to the FAA reauthorization bill or similar legislation were to be enacted, it is uncertain what effect it would have on our results of operations and financial condition.

We cannot assure you that these and other laws or regulations enacted in the future will not harm our business. In addition, the TSA mandates the federalization of certain airport security procedures and imposes additional security requirements on airports and airlines, most of which are funded by a per ticket tax on passengers and a tax on airlines. The federal government has on several occasions proposed a significant increase in the per ticket tax. The proposed ticket tax increase, if implemented, could negatively impact our financial results.

Our ability to operate as an airline is dependent on our maintaining certifications issued to us by the DOT and the FAA. The FAA has the authority to issue mandatory orders relating to, among other things, the grounding of aircraft, inspection of aircraft, installation of new safety-related items and removal and replacement of aircraft parts that have failed or may fail in the future. A decision by the FAA to ground, or require time consuming inspections of or maintenance on, our aircraft, for any reason, could negatively affect our business and financial results. Federal law requires that air carriers operating large aircraft be continuously “fit, willing and able” to provide the services for which they are licensed. Our “fitness” is monitored by the DOT, which considers factors such as unfair or deceptive competition, advertising, baggage liability and disabled passenger transportation. While the DOT has seldom revoked a carrier’s certification for lack of fitness, such an occurrence would render it impossible for us to continue operating as an airline. The DOT may also institute investigations or administrative proceedings against airlines for violations of regulations.

International routes are regulated by treaties and related agreements between the United States and foreign governments. Our ability to operate international routes is subject to change because the applicable arrangements between the United States and foreign governments may be amended from time to time. Our access to new international markets may be limited by our ability to obtain the necessary certificates to fly the international routes. In addition, our operations in foreign countries are subject to regulation by foreign governments and our business may be affected by changes in law and future actions taken by such governments, including granting or withdrawal of government approvals and restrictions on competitive practices. We are subject to numerous foreign regulations based on the large number of countries outside the United States where we currently provide service. If we are not able to comply with this complex regulatory regime, our business could be significantly harmed. Please see “Business—Government Regulation.”

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We may not be able to implement our growth strategy.

Our growth strategy includes acquiring additional aircraft, increasing the frequency of flights and size of aircraft used in markets we currently serve and expanding the number of markets we serve where our low cost structure would likely be successful. Effectively implementing our growth strategy is critical for our business to achieve economies of scale and to sustain or increase our profitability. We face numerous challenges in implementing our growth strategy, including our ability to:

• maintain profitability;

• obtain financing to acquire new aircraft;

• access airports located in our targeted geographic markets where we can operate routes in a manner that is consistent with our cost strategy;

• gain access to international routes; and

• access sufficient gates and other services at airports we currently serve or may seek to serve.

Our growth is dependent upon our ability to maintain a safe and secure operation and requires additional personnel, equipment and facilities. An inability to hire and retain personnel, timely secure the required equipment and facilities in a cost-effective manner, efficiently operate our expanded facilities or obtain the necessary regulatory approvals may adversely affect our ability to achieve our growth strategy, which could harm our business. In addition, expansion to new markets may have other risks due to factors specific to those markets. We may be unable to foresee all of the risks attendant upon entering certain new markets or respond adequately to these risks, and our growth strategy and our business may suffer as a result. In addition, our competitors may reduce their fares and/or offer special promotions following our entry into a new market. We cannot assure you that we will be able to profitably expand our existing markets or establish new markets.

Some of our target growth markets in the Caribbean and Latin America include countries with less developed economies that may be vulnerable to unstable economic and political conditions, such as significant fluctuations in gross domestic product, interest and currency exchange rates, civil disturbances, government instability, nationalization and expropriation of private assets and the imposition of taxes or other charges by governments. The occurrence of any of these events in markets served by us and the resulting instability may adversely affect our ability to implement our growth strategy.

In 2008, in response to record high fuel prices and rapidly deteriorating economic conditions, we modified our growth plans by terminating our leases for seven aircraft. We incurred significant expenses relating to our lease terminations, and have incurred additional expenses to acquire new aircraft in place of those under the terminated leases as we expand our network. We may in the future determine to reduce further our future growth plans from previously announced levels, which may impact our business strategy and future profitability.

We rely heavily on technology and automated systems to operate our business and any failure of these technologies or systems or failure by their operators could harm our business.

We are highly dependent on technology and automated systems to operate our business and achieve low operating costs. These technologies and systems include our computerized airline reservation system, flight operations system, financial planning, management and accounting system, telecommunications systems, website, maintenance systems and check-in kiosks. In order for our operations to work efficiently, our website and reservation system must be able to accommodate a high volume of traffic, maintain secure information and deliver flight information. Substantially all of our tickets are issued to passengers as electronic tickets. We depend on our reservation system, which is hosted and maintained under a long-term contract by a third-party service provider, to be able to issue, track and accept these electronic tickets. If our reservation system fails or experiences interruptions, and we are unable to book seats for any period of time, we could lose a significant amount of revenue as customers book seats on competing airlines. We have experienced short duration reservation system outages from time to time and may experience similar outages in the future. For example, in November 2010, we experienced a significant service outage with our third-party reservation service provider on the day before Thanksgiving, one of the industry’s busiest travel days. We also rely on third-party service providers of our other automated systems for technical support, system maintenance and software upgrades. If our automated systems are not functioning or if the current providers were to fail to adequately provide technical support or timely software upgrades for any one of our key existing systems, we could experience service disruptions, which could harm our business and result in the loss of important data, increase our expenses and decrease our revenues. In the event that one or more of our primary technology or systems’ vendors goes into bankruptcy, ceases operations or fails to perform as promised, replacement services may not be readily available on a timely basis, at competitive rates or at all and any transition time to a new system may be significant.

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In addition, our automated systems cannot be completely protected against events that are beyond our control, including natural disasters, computer viruses or telecommunications failures. Substantial or sustained system failures could cause service delays or failures and result in our customers purchasing tickets from other airlines. We have implemented security measures and change control procedures and have disaster recovery plans; however, we cannot assure you that these measures are adequate to prevent disruptions. Disruption in, changes to or a breach of, these systems could result in a disruption to our business and the loss of important data. Any of the foregoing could result in a material adverse effect on our business, results of operations and financial condition.

We are subject to cyber security risks and may incur increasing costs in an effort to minimize those risks.

Our business employs systems and websites that allow for the secure storage and transmission of proprietary or confidential information regarding our customers, employees, suppliers and others, including personal identification information, credit card data, and other confidential information. Security breaches could expose us to a risk of loss or misuse of this information, litigation, and potential liability. Although we take steps to secure our management information systems, and although multiple auditors review and approve the security configurations and management processes of these systems, including our computer systems, intranet and internet sites, email and other telecommunications and data networks, the security measures we have implemented may not be effective, and our systems may be vulnerable to theft, loss, damage and interruption from a number of potential sources and events, including unauthorized access or security breaches, natural or man-made disasters, cyber attacks, computer viruses, power loss, or other disruptive events.  We may not have the resources or technical sophistication to anticipate or prevent rapidly evolving types of cyber attacks. Attacks may be targeted at us, our customers and suppliers, or others who have entrusted us with information. In addition, attacks not targeted at us, but targeted solely at suppliers, may cause disruption to our computer systems or a breach of the data that we maintain on customers, employees, suppliers, and others.

Actual or anticipated attacks may cause us to incur increasing costs, including costs to deploy additional personnel and protection technologies, train employees, and engage third-party experts and consultants, or costs incurred in connection with the notifications to employees, suppliers, or the general public as part of our notification obligations to the various governments that govern our business. Advances in computer capabilities, new technological discoveries, or other developments may result in the breach or compromise of technology used by us to protect transaction or other data. In addition, data and security breaches can also occur as a result of non-technical issues, including breaches by us or by persons with whom we have commercial relationships that result in the unauthorized release of personal or confidential information. Our reputation, brand, and financial condition could be adversely affected if, as a result of a significant cyber event or other security issues: our operations are disrupted or shut down; our confidential, proprietary information is stolen or disclosed; we incur costs or are required to pay fines in connection with stolen customer, employee or other confidential information; we must dedicate significant resources to system repairs or increase cyber security protection; or we otherwise incur significant litigation or other costs.

Our processing, storage, use and disclosure of personal data could give rise to liabilities as a result of governmental regulation.

In the processing of our customer transactions, we receive, process, transmit and store a large volume of identifiable personal data, including financial data such as credit card information. This data is increasingly subject to legislation and regulation, typically intended to protect the privacy of personal data that is collected, processed and transmitted. More generally, we rely on consumer confidence in the security of our system, including our website on which we sell the majority of our tickets. Our business, results of operations and financial condition could be adversely affected if we are unable to comply with existing privacy obligations or legislation or regulations are expanded to require changes in our business practices.

We may not be able to maintain or grow our non-ticket revenues.

Our business strategy includes expanding our portfolio of ancillary products and services. There can be no assurance that passengers will pay for additional ancillary products and services or that passengers will continue to choose to pay for the ancillary products and services we currently offer. Further, regulatory initiatives could adversely affect ancillary revenue opportunities. Failure to maintain our non-ticket revenues would have a material adverse effect on our results of operations and financial condition. Furthermore, if we are unable to maintain and grow our non-ticket revenues, we may not be able to execute our strategy to continue to lower base fares in order to stimulate demand for air travel. Please see “—Restrictions on or increased taxes applicable to charges for ancillary products and services paid by airline passengers and burdensome consumer protection regulations or laws could harm our business, results of operations and financial condition.”

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Our inability to expand or operate reliably or efficiently out of our key airports where we maintain a large presence could have a material adverse effect on our business, results of operations and financial condition.

We are highly dependent on markets served from airports where we maintain a large presence. Our results of operations may be affected by actions taken by governmental or other agencies or authorities having jurisdiction over our operations at airports, including, but not limited to:

• increases in airport rates and charges;

• limitations on take-off and landing slots, airport gate capacity or other use of airport facilities;

• termination of our airport use agreements, some of which can be terminated by airport authorities with little notice to us;

• increases in airport capacity that could facilitate increased competition;

• international travel regulations such as customs and immigration;

• increases in taxes;

• changes in the law that affect the services that can be offered by airlines in particular markets and at particular airports;

• restrictions on competitive practices;

• the adoption of statutes or regulations that impact customer service standards, including security standards; and

• the adoption of more restrictive locally-imposed noise regulations or curfews.

In general, any changes in airport operations could have a material adverse effect on our business, results of operations and financial condition.

We rely on third-party service providers to perform functions integral to our operations.

We have entered into agreements with third-party service providers to furnish certain facilities and services required for our operations, including ground handling, catering, passenger handling, engineering, maintenance, refueling, reservations and airport facilities as well as administrative and support services. We are likely to enter into similar service agreements in new markets we decide to enter, and there can be no assurance that we will be able to obtain the necessary services at acceptable rates.

Although we seek to monitor the performance of third parties that provide us with our reservation system, ground handling, catering, passenger handling, engineering, maintenance services, refueling and airport facilities, the efficiency, timeliness and quality of contract performance by third-party service providers are often beyond our control, and any failure by our service providers to perform their contracts may have an adverse impact on our business and operations. For example, in 2008, our call center provider went bankrupt. Though we were able to quickly switch to an alternative vendor, we experienced a significant business disruption during the transition period and a similar disruption could occur in the future if we changed call center providers or if an existing provider ceased to be able to serve us. We expect to be dependent on such third-party arrangements for the foreseeable future.

We rely on third-party distribution channels to distribute a portion of our airline tickets.

We rely on third-party distribution channels, including those provided by or through global distribution systems, or GDSs, conventional travel agents and online travel agents, or OTAs, to distribute a portion of our airline tickets, and we expect in the future to rely on these channels to an increasing extent to collect ancillary revenues. These distribution channels are more expensive and at present have less functionality in respect of ancillary revenues than those we operate ourselves, such as our call centers and our website. Certain of these distribution channels also effectively restrict the manner in which we distribute our products generally. To remain competitive, we will need to successfully manage our distribution costs and rights, and improve the functionality of third-party distribution channels, while maintaining an industry-competitive cost structure. Negotiations with key GDSs and OTAs designed to manage our costs, increase our distribution flexibility, and improve functionality could be contentious, could result in diminished or less favorable distribution of our tickets, and may not provide the functionality we require to maximize ancillary revenues. Any inability to manage our third-party distribution costs, rights and functionality at a competitive level or any material diminishment in the distribution of our tickets could have a material adverse effect on our competitive position and our results of operations. Moreover, our ability to compete in the markets we

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serve may be threatened by changes in technology or other factors that may make our existing third-party sales channels impractical, uncompetitive, or obsolete.

We rely on a single service provider to manage our fuel supply.

As of December 31, 2012, we had a single fuel service contract with World Fuel Services Corporation to manage the sourcing and contracting of our fuel supply with our third-party vendors. A failure by this provider to fulfill its obligations could have a material adverse effect on our business, results of operations and financial condition.

Our reputation and business could be adversely affected in the event of an emergency, accident or similar incident involving our aircraft.

We are exposed to potential significant losses in the event that any of our aircraft is subject to an emergency, accident, terrorist incident or other similar incident, and significant costs related to passenger claims, repairs or replacement of a damaged aircraft and its temporary or permanent loss from service. There can be no assurance that we will not be affected by such events or that the amount of our insurance coverage will be adequate in the event such circumstances arise and any such event could cause a substantial increase in our insurance premiums. Please see “—Increases in insurance costs or significant reductions in coverage could have a material adverse effect on our business, financial condition and results of operations.” In addition, any future aircraft emergency, accident or similar incident, even if fully covered by insurance or even if it does not involve our airline, may create a public perception that our airline or the equipment we fly is less safe or reliable than other transportation alternatives, which could have an adverse impact on our reputation and could have a material adverse effect on our business, results of operations and financial condition.

Negative publicity regarding our customer service could have a material adverse effect on our business.

In the past we have experienced a relatively high number of customer complaints related to, among other things, our customer service, and reservations and ticketing systems. In particular, we generally experience a higher volume of complaints when we make changes to our unbundling policies, such as charging for baggage. In addition, in 2009, we entered into a consent order with the DOT for our procedures for bumping passengers from oversold flights and our handling of lost or damaged baggage. Under the consent order, we were assessed a civil penalty of $375,000, of which we were required to pay $215,000 based on an agreement with the DOT and our not having similar violations in the year after the date of the consent order. Our reputation and business could be materially adversely affected if we fail to meet customers’ expectations with respect to customer service or if we are perceived by our customers to provide poor customer service.

We depend on a limited number of suppliers for our aircraft and engines.

One of the elements of our business strategy is to save costs by operating a single-family aircraft fleet - currently Airbus A320-family, single-aisle aircraft, powered by engines manufactured by IAE. If Airbus or IAE (or any other engine manufacturer for future deliveries) becomes unable to perform its contractual obligations, or if we are unable to acquire or lease aircraft or engines from other owners, operators or lessors on acceptable terms, we would have to find other suppliers for a similar type of aircraft or engine. If we have to lease or purchase aircraft from another supplier, we would lose the significant benefits we derive from our current single fleet composition. We may also incur substantial transition costs, including costs associated with retraining our employees, replacing our manuals and adapting our facilities and maintenance programs. Our operations could also be harmed by the failure or inability of aircraft, engine and parts suppliers to provide sufficient spare parts or related support services on a timely basis. Our business would be significantly harmed if a design defect or mechanical problem with any of the types of aircraft or components that we operate were discovered that would ground any of our aircraft while the defect or problem was corrected, assuming it could be corrected at all. The use of our aircraft could be suspended or restricted by regulatory authorities in the event of any actual or perceived mechanical or design problems. Our business would also be significantly harmed if the public began to avoid flying with us due to an adverse perception of the types of aircraft that we operate stemming from safety concerns or other problems, whether real or perceived, or in the event of an accident involving those types of aircraft or components. Carriers that operate a more diversified fleet are better positioned than we are to manage such events.

Reduction in demand for air transportation, or governmental reduction or limitation of operating capacity, in the South Florida, Caribbean, Latin American or Northeast U.S. markets could harm our business, results of operations and financial condition.

A significant portion of our operations are conducted to and from the South Florida, Caribbean, Latin American or Northeast U.S. markets. Our business, results of operations and financial condition could be harmed if we lost our authority to fly to these markets, by any circumstances causing a reduction in demand for air transportation, or by governmental reduction or limitation of operating capacity, in these markets, such as adverse changes in local economic or political conditions, negative

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public perception of these destinations, unfavorable weather conditions, or terrorist related activities. Furthermore, our business could be harmed if jurisdictions that currently limit competition allow additional airlines to compete on routes we serve. Many of the countries we serve are experiencing either economic slowdowns or recessions, which may translate into a weakening of demand and could harm our business, results of operations and financial condition.

Increases in insurance costs or significant reductions in coverage could have a material adverse effect on our business, financial condition and results of operations.

We carry insurance for public liability, passenger liability, property damage and all-risk coverage for damage to our aircraft. As a result of the September 11, 2001 terrorist attacks, aviation insurers significantly reduced the amount of insurance coverage available to commercial air carriers for liability to persons other than employees or passengers for claims resulting from acts of terrorism, war or similar events (war risk insurance). Accordingly, our insurance costs increased significantly and our ability to continue to obtain certain types of insurance remains uncertain. While the price of commercial insurance has declined since the period immediately after the terrorist attacks, in the event commercial insurance carriers further reduce the amount of insurance coverage available to us, or significantly increase its cost, we would be adversely affected. We currently maintain commercial airline insurance with several underwriters. However, there can be no assurance that the amount of such coverage will not be changed, or that we will not bear substantial losses from accidents. We could incur substantial claims resulting from an accident in excess of related insurance coverage that could have a material adverse effect on our results of operations and financial condition.

We have obtained third-party war risk insurance, which insures against some risks of terrorism, through a special program administered by the FAA, resulting in lower premiums than if we had obtained this insurance in the commercial insurance market. If the special program administered by the FAA is not continued, or if the government discontinues this coverage for any reason, obtaining comparable coverage from commercial underwriters could result in substantially higher premiums and more restrictive terms, if it is available at all. Our business, results of operations and financial condition could be materially adversely affected if we are unable to obtain adequate war risk insurance. The FAA war risk hull and liability insurance policy is effective from October 1, 2012 through September 30, 2013.

Failure to comply with applicable environmental regulations could have a material adverse effect on our business, results of operations and financial condition.

We are subject to increasingly stringent federal, state, local and foreign laws, regulations and ordinances relating to the protection of the environment, including those relating to emissions to the air, discharges to surface and subsurface waters, safe drinking water, and the management of hazardous substances, oils and waste materials. Compliance with all environmental laws and regulations can require significant expenditures and any future regulatory developments in the United States and abroad could adversely affect operations and increase operating costs in the airline industry. For example, climate change legislation was previously introduced in Congress and such legislation could be re-introduced in the future by Congress and state legislatures, and could contain provisions affecting the aviation industry, compliance with which could result in the creation of substantial additional costs to us. Similarly, the Environmental Protection Agency issued a rule that regulates larger emitters of greenhouse gases. Future operations and financial results may vary as a result of such regulations. Compliance with these regulations and new or existing regulations that may be applicable to us in the future could increase our cost base and could have a material adverse effect on our business, results of operations and financial condition.

Governmental authorities in several U.S. and foreign cities are also considering or have already implemented aircraft noise reduction programs, including the imposition of nighttime curfews and limitations on daytime take-offs and landings. We have been able to accommodate local noise restrictions imposed to date, but our operations could be adversely affected if locally-imposed regulations become more restrictive or widespread.

If we are unable to attract and retain qualified personnel or fail to maintain our company culture, our business, results of operations and financial condition could be harmed.

Our business is labor intensive. We require large numbers of pilots, flight attendants, maintenance technicians and other personnel. The airline industry has from time to time experienced a shortage of qualified personnel, particularly with respect to pilots and maintenance technicians. In addition, as is common with most of our competitors, we have faced considerable turnover of our employees. We may be required to increase wages and/or benefits in order to attract and retain qualified personnel. If we are unable to hire, train and retain qualified employees, our business could be harmed and we may be unable to implement our growth plans.

In addition, as we hire more people and grow, we believe it may be increasingly challenging to continue to hire people who will maintain our company culture. Our company culture, which we believe is one of our competitive strengths, is important to providing high-quality customer service and having a productive, accountable workforce that helps keep our costs

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low. As we continue to grow, we may be unable to identify, hire or retain enough people who meet the above criteria, including those in management or other key positions. Our company culture could otherwise be adversely affected by our growing operations and geographic diversity. If we fail to maintain the strength of our company culture, our competitive ability and our business, results of operations and financial condition could be harmed.

Our business, results of operations and financial condition could be materially adversely affected if we lose the services of our key personnel.

Our success depends to a significant extent upon the efforts and abilities of our senior management team and key financial and operating personnel. In particular, we depend on the services of our senior management team, including Ben Baldanza, our President and Chief Executive Officer. Competition for highly qualified personnel is intense, and the loss of any executive officer, senior manager or other key employee without adequate replacement or the inability to attract new qualified personnel could have a material adverse effect on our business, results of operations and financial condition. We do not maintain key-man life insurance on our management team.

Ownership by our principal stockholders could adversely affect our other stockholders.

As of February 11, 2013, entities affiliated with Indigo Partners, or Indigo, a private equity firm, beneficially owned approximately 16.6% of our outstanding common stock. As a result of its ownership positions, Indigo is able to exert a significant degree of influence or actual control over our management and affairs and over matters requiring stockholder approval, including the nomination and election of directors, a merger, consolidation or sale of all or substantially all of our assets and other significant business or corporate transactions. Indigo's ownership interest may limit the ability of other stockholders to influence corporate matters and, as a result, we may take actions that our other stockholders do not view as beneficial. For example, this substantial ownership stake could have the effect of delaying or preventing a change in control or otherwise discouraging a potential acquirer from attempting to obtain control of us, which in turn could cause the market price of our common stock to decline or prevent our stockholders from realizing a premium over the market price for their common stock.

The requirements of being a public company may strain our resources, divert management’s attention and affect our ability to attract and retain qualified board members.

As a public company, we incur significant legal, accounting and other expenses that we did not incur as a private company, including costs associated with public company reporting requirements. We also have incurred and will incur costs associated with the Sarbanes-Oxley Act of 2002, as amended, the Dodd-Frank Wall Street Reform and Consumer Protection Act and related rules implemented or to be implemented by the SEC and the NASDAQ Stock Market. The expenses incurred by public companies generally for reporting and corporate governance purposes have been increasing. We expect these rules and regulations to increase our legal and financial compliance costs and to make some activities more time-consuming and costly, although we are currently unable to estimate these costs with any degree of certainty. These laws and regulations could also make it more difficult or costly for us to obtain certain types of insurance, including director and officer liability insurance, and we may be forced to accept reduced policy limits and coverage or incur substantially higher costs to obtain the same or similar coverage. These laws and regulations could also make it more difficult for us to attract and retain qualified persons to serve on our board of directors, our board committees or as our executive officers and may divert management’s attention. Furthermore, if we are unable to satisfy our obligations as a public company, we could be subject to delisting of our common stock, fines, sanctions and other regulatory action and potentially civil litigation.

We are required to assess our internal control over financial reporting on an annual basis, and any future adverse findings from such assessment could result in a loss of investor confidence in our financial reports, significant expenses to remediate any internal control deficiencies and ultimately have an adverse effect on the market price of our common stock.

Pursuant to Section 404 of the Sarbanes-Oxley Act of 2002, as amended, our management is required to report on, and our independent registered public accounting firm to attest to, the effectiveness of our internal control over financial reporting. The rules governing the standards that must be met for management to assess our internal control over financial reporting are complex and require significant documentation, testing and possible remediation. Annually, we perform activities that include reviewing, documenting, and testing our internal control over financial reporting. During the performance of these activities, we may encounter problems or delays in completing the implementation of any changes necessary to make a favorable assessment of our internal control over financial reporting. In connection with the attestation process by our independent registered public accounting firm, we may encounter problems or delays in completing the implementation of any requested improvements and receiving a favorable attestation. In addition, if we fail to maintain the adequacy of our internal control over financial reporting we will not be able to conclude on an ongoing basis that we have effective internal control over financial reporting in accordance with Section 404. If we fail to achieve and maintain an effective internal control environment, we

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could suffer material misstatements in our financial statements and fail to meet our reporting obligations, which would likely cause investors to lose confidence in our reported financial information. This could harm our operating results and lead to a decline in our stock price. Additionally, ineffective internal control over financial reporting could expose us to increased risk of fraud or misuse of corporate assets and subject us to potential delisting from the NASDAQ Global Select Market, regulatory investigations, civil or criminal sanctions and class action litigation.

The market price of our common stock may be volatile, which could cause the value of an investment in our stock to decline.

The market price of our common stock may fluctuate substantially due to a variety of factors, many of which are beyond our control, including:

• announcements concerning our competitors, the airline industry or the economy in general;

• strategic actions by us or our competitors, such as acquisitions or restructurings;

• media reports and publications about the safety of our aircraft or the aircraft type we operate;

• new regulatory pronouncements and changes in regulatory guidelines;

• changes in the price of aircraft fuel;

• announcements concerning the availability of the type of aircraft we use;

• general and industry-specific economic conditions;

• changes in financial estimates or recommendations by securities analysts or failure to meet analysts’ performance expectations;

• sales of our common stock or other actions by investors with significant shareholdings;

• trading strategies related to changes in fuel or oil prices; and

• general market, political and economic conditions.

The stock markets in general have experienced substantial volatility that has often been unrelated to the operating performance of particular companies. These types of broad market fluctuations may adversely affect the trading price of our common stock.

In the past, stockholders have sometimes instituted securities class action litigation against companies following periods of volatility in the market price of their securities. Any similar litigation against us could result in substantial costs, divert management’s attention and resources, and harm our business or results of operations.

If securities or industry analysts do not publish research or reports about our business, or publish negative reports about our business, our stock price and trading volume could decline.

The trading market for our common stock depends in part on the research and reports that securities or industry analysts publish about us or our business. If one or more of the analysts who cover us downgrade our stock or publish inaccurate or unfavorable research about our business, our stock price would likely decline. If one or more of these analysts cease coverage of our company or fail to publish reports on us regularly, demand for our stock could decrease, which might cause our stock price and trading volume to decline.

Our anti-takeover provisions may delay or prevent a change of control, which could adversely affect the price of our common stock.

Our amended and restated certificate of incorporation and amended and restated bylaws contain provisions that may make it difficult to remove our board of directors and management and may discourage or delay “change of control” transactions, which could adversely affect the price of our common stock. These provisions include, among others:

• our board of directors is divided into three classes, with each class serving for a staggered three-year term, which prevents stockholders from electing an entirely new board of directors at an annual meeting;

• actions to be taken by our stockholders may only be effected at an annual or special meeting of our stockholders and not by written consent;

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• special meetings of our stockholders can be called only by the Chairman of the Board or by our corporate secretary at the direction of our board of directors;

• advance notice procedures that stockholders must comply with in order to nominate candidates to our board of directors and propose matters to be brought before an annual meeting of our stockholders may discourage or deter a potential acquirer from conducting a solicitation of proxies to elect the acquirer’s own slate of directors or otherwise attempting to obtain control of our company; and

• our board of directors may, without stockholder approval, issue series of preferred stock, or rights to acquire preferred stock, that could dilute the interest of, or impair the voting power of, holders of our common stock or could also be used as a method of discouraging, delaying or preventing a change of control.

The value of our common stock may be adversely affected by additional issuances of common stock or preferred stock by us or sales by our principal stockholders.

Any future issuances or sales of our common stock by us will be dilutive to our existing common stockholders. Indigo (and its affiliates) hold approximately 12.1 million shares of our common stock or 16.6% of our common stock outstanding as of February 11, 2013, and are entitled to rights with respect to registration of such shares under the Securities Act. Sales of substantial amounts of our common stock in the public or private market, a perception in the market that such sales could occur, or the issuance of securities exercisable or convertible into our common stock, could adversely affect the prevailing price of our common stock.

Our corporate charter and bylaws include provisions limiting voting by non-U.S. citizens and specifying an exclusive forum for stockholder disputes.

To comply with restrictions imposed by federal law on foreign ownership of U.S. airlines, our amended and restated certificate of incorporation and amended and restated bylaws restrict voting of shares of our common stock by non-U.S. citizens. The restrictions imposed by federal law currently require that no more than 25% of our stock be voted, directly or indirectly, by persons who are not U.S. citizens, and that our president and at least two-thirds of the members of our board of directors and senior management be U.S. citizens. Our amended and restated bylaws provide that the failure of non-U.S. citizens to register their shares on a separate stock record, which we refer to as the “foreign stock record,” would result in a suspension of their voting rights in the event that the aggregate foreign ownership of the outstanding common stock exceeds the foreign ownership restrictions imposed by federal law.

Our amended and restated bylaws further provide that no shares of our common stock will be registered on the foreign stock record if the amount so registered would exceed the foreign ownership restrictions imposed by federal law. If it is determined that the amount registered in the foreign stock record exceeds the foreign ownership restrictions imposed by federal law, shares will be removed from the foreign stock record in reverse chronological order based on the date of registration therein, until the number of shares registered therein does not exceed the foreign ownership restrictions imposed by federal law. We are currently in compliance with these ownership restrictions.

As of February 11, 2013, based on our foreign stock registry, non-U.S. citizens own, in the aggregate, 14.8 million shares of common stock (approximately 20.4% of our common stock outstanding). As of February 11, 2013, there are no shares of non-voting common stock outstanding. When shares of non-voting common stock are outstanding, the holders of such stock may convert such shares, on a share-for-share basis, in the order reflected on our foreign stock record as shares of common stock are sold or otherwise transferred by non-U.S. citizens to U.S. citizens.

Our amended and restated certificate of incorporation also specifies that the Court of Chancery of the State of Delaware shall be the exclusive forum for substantially all disputes between us and our stockholders.

We do not intend to pay cash dividends for the foreseeable future.

We have never declared or paid cash dividends on our common stock. We currently intend to retain our future earnings, if any, to finance the further development and expansion of our business and do not intend to pay cash dividends in the foreseeable future. Any future determination to pay dividends will be at the discretion of our board of directors and will depend on our financial condition, results of operations, capital requirements, restrictions contained in current or future financing instruments, business prospects and such other factors as our board of directors deems relevant.

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ITEM 1B.    UNRESOLVED STAFF COMMENTS

None.

ITEM 2.    PROPERTIES

Aircraft

The Company operated a total of 45 aircraft, all of which are under operating leases, as of December 31, 2012.

The following table details information on the 45 aircraft in the Company’s fleet as of December 31, 2012:

Aircraft Type	Seats	Average Age (years)	Number of Aircraft
A319	145	6.3	27
A320	178	1.4	16
A321	218	7.4	2
		4.6	45

As of December 31, 2012, firm aircraft orders with Airbus and a third party consisted of 106 A320 family aircraft (two used A319 aircraft, 54 of the existing A320 aircraft model, and 50 A320 NEOs). Aircraft are scheduled for delivery from 2013 through 2021, as illustrated in the table below.

	Number of Aircraft at Year-End *
Aircraft Type	2013	2014	2015	2016	2017	2018	2019	2020	2021
A319	29	29	29	26	17	8	2	—	—
A320	23	30	40	50	63	68	68	68	68
A320 NEO	—	—	—	—	—	6	19	32	45
A321	2	2	2	2	—	—	—	—	—
Total Aircraft	54	61	71	78	80	82	89	100	113

* Table reflects deliveries net of contractual lease returns. Table excludes five A320 NEO aircraft for which the Company has signed a Letter of Intent with International Lease Finance Corporation (ILFC), however delivery dates are contingent upon the engine type selection which has not yet been determined. Actual fleet count may differ depending on future fleet decisions, including actual lease retirements.

We also have a contractual purchase commitment for three spare V2500 IAE International Aero Engines AG engines scheduled for delivery from 2013 through 2015.

Ground Facilities    

We lease all of our facilities at each of the airports we serve. Our leases for terminal passenger service facilities, which include ticket counter and gate space, operations support areas and baggage service offices, generally have a term ranging from month-to-month to 20 years, and contain provisions for periodic adjustments of lease rates. We also are responsible for maintenance, insurance and other facility-related expenses and services. We also have entered into use agreements at many of the airports we serve that provide for the non-exclusive use of runways, taxiways and other facilities. Landing fees under these agreements are based on the number of landings and weight of the aircraft.

As of December 31, 2012, Ft. Lauderdale/Hollywood International Airport (FLL) remained our single largest airport served, with over 20% of our capacity operating to or from FLL during 2012. We operate primarily out of the international terminal, Terminal 4, with occasional use of a gate in Terminal 3. We currently use up to ten gates at Terminal 4. We have preferential access to seven of the Terminal 4 gates, common use access to the remaining three Terminal 4 gates, and common use access to Terminal 3 gates. FLL is planning a Terminal 4 concourse replacement and expansion project, which would expand the number of gates at Terminal 4 to 14. Other airports through which we conduct significant operations include McCarran International Airport (LAS), Chicago O'Hare International Airport (ORD), Dallas-Fort Worth International Airport (DFW), Detroit Metropolitan Wayne County Airport (DTW), Atlantic City International Airport (ACY), and LaGuardia Airport (LGA).

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Our largest maintenance facility is currently located in a leased facility at FLL under a lease that expires in January 2015. We also conduct additional maintenance operations in leased facilities in Detroit, Michigan; Atlantic City, New Jersey; Dallas, Texas; and Las Vegas, Nevada.

Our principal executive offices and headquarters are located in a leased facility at 2800 Executive Way, Miramar, Florida 33025, consisting of approximately 56,000 square feet. The lease for this facility expires in January 2015. We also have a training center located in a leased facility at 1100 Lee Wagener Boulevard, Fort Lauderdale, Florida 33315, consisting of approximately 10,000 square feet, under a lease that expires in January 2015.

ITEM 3.    LEGAL PROCEEDINGS

We are subject to commercial litigation claims and to administrative and regulatory proceedings and reviews that may be asserted or maintained from time to time. We believe the ultimate outcome of pending lawsuits, proceedings and reviews will not, individually or in the aggregate, have a material adverse effect on our financial position, liquidity, or results of operations.

ITEM 4.    MINE SAFETY DISCLOSURES

Not applicable.

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PART II

ITEM 5.    MARKET FOR REGISTRANT'S COMMON EQUITY, RELATED STOCKHOLDER MATTERS, AND ISSUER PURCHASES OF EQUITY SECURITIES

Market Price of our common stock

Our common stock has been listed and traded on the NASDAQ Global Select Market under the symbol SAVE since May 26, 2011 when our IPO priced at $12.00 per share. Prior to that time, there was no public market for our common stock. The following table shows, for the periods indicated, the high and low per share sales prices for our common stock on the NASDAQ Global Select Market.

	High		Low
Fiscal year ending December 31, 2011
Second Quarter (from May 26, 2011)	$	12.33	$	11.11
Third Quarter	14.43		10.18
Fourth Quarter	17.48		11.45
Fiscal year ending December 31, 2012
First Quarter	$	20.70	$	13.90
Second Quarter	24.75		17.41
Third Quarter	23.13		15.85
Fourth Quarter	18.00		15.64

As of February 11, 2013, there were approximately 23 holders of record of our common stock. Because many of our shares are held by brokers and other institutions on behalf of stockholders, we are unable to estimate the total number of stockholders represented by these record holders.

The information under the caption “Equity Compensation Plan Information” in our 2013 Proxy Statement is incorporated herein by reference.

Dividend Policy

We have never declared or paid, and do not anticipate declaring or paying, any cash dividends on our common stock. Any future determination as to the declaration and payment of dividends, if any, will be at the discretion of our board of directors and will depend on then existing conditions, including our financial condition, operating results, contractual restrictions, capital requirements, business prospects and other factors our board of directors may deem relevant.

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Our Repurchases of Equity Securities

The following table reflects our repurchases of our common stock during the fourth quarter of 2012. All stock repurchases during this period were made from employees who received restricted stock grants. All stock repurchases were made at the election of each employee pursuant to an offer to repurchase by us. In each case, the shares repurchased constituted the portion of vested shares necessary to satisfy minimum withholding tax requirements.

ISSUER PURCHASES OF EQUITY SECURITIES
Period	Total Number of Shares Purchased	Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	Approximate Dollar Value of Shares that May Yet be Purchased Under Plans or Programs.
October 1-31, 2012	—	N/A		—	—
November 1-30, 2012	—	N/A		—	—
December 1-31, 2012	5,107	$	16.75	—	—
Total	5,107	$	16.75	—	—

During the first three quarters of 2012, we repurchased and retired 46,718 shares for a total of $0.9 million. All stock repurchases were made at the election of each employee pursuant to an offer to repurchase by us. In each case, the shares repurchased constituted the portion of vested shares necessary to satisfy withholding tax requirements. We did not make any open market stock repurchases during the fourth quarter of 2012.

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Stock Performance Graph

The following graph compares the cumulative total stockholder return on our common stock with the cumulative total return on the NASDAQ Composite Index and the NYSE ARCA Airline Index for the period beginning on May 26, 2011 (the date our common stock was first traded) and ending on the last day of 2012. The graph assumes an investment of $100 in our stock and the two indices, respectively, on May 26, 2011, and further assumes the reinvestment of all dividends. The May 26, 2011 stock price used for our stock is the initial public offering price. Stock price performance, presented for the period from May 26, 2011 to December 31, 2012, is not necessarily indicative of future results.

	5/26/2011		12/31/2011		12/31/2012
Spirit	$	100.00	$	130.00	$	147.75
NYSE ARCA Airline Index	$	100.00	$	75.49	$	103.90
NASDAQ Composite Index	$	100.00	$	94.23	$	110.91

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ITEM 6.    SELECTED FINANCIAL DATA

You should read the following selected historical financial and operating data below in conjunction with “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and the financial statements, related notes and other financial information included in this annual report. The selected financial data in this section are not intended to replace the financial statements and are qualified in their entirety by the financial statements and related notes included in this annual report.

We derived the selected statements of operations data for the years ended December 31, 2012, 2011 and 2010 and the balance sheet data as of December 31, 2012 and 2011 from our audited financial statements included in this annual report. We derived the selected statements of operations data for the years ended December 31, 2009 and 2008 and the balance sheet data as of December 31, 2008, 2009 and 2010 from our audited financial statements not included in this annual report. Our historical results are not necessarily indicative of the results to be expected in the future.

	Year Ended December 31,
	2012			2011			2010 (1)			2009			2008
	(in thousands except share and per share data)
Operating revenues:
Passenger	$	782,792		$	689,650		$	537,969		$	536,181		$	657,448
Non-ticket	535,596			381,536			243,296			163,856			129,809
Total operating revenue	1,318,388			1,071,186			781,265			700,037			787,257
Operating expenses:
Aircraft fuel (2)	471,763			388,046			248,206			181,107			299,094
Salaries, wages and benefits	218,919			181,742			156,443			135,420			147,015
Aircraft rent	143,572			116,485			101,345			89,974			105,605
Landing fees and other rents	68,368			52,794			48,118			42,061			43,331
Distribution	56,668			51,349			41,179			34,067			37,816
Maintenance, materials and repairs	49,460			34,017			27,035			27,536			24,237
Depreciation and amortization	15,256			7,760			5,620			4,924			4,236
Other operating	127,886			91,172			83,748			72,921			85,608
Loss on disposal of assets	956			255			77			1,010			4,122
Special charges (credits) (3)	(8,450		)	3,184			621			(392		)	17,902
Total operating expenses	1,144,398			926,804			712,392			588,628			768,966
Operating income	173,990			144,382			68,873			111,409			18,291
Other expense (income):
Interest expense (4)	1,350			24,781			50,313			46,892			40,245
Capitalized interest (5)	(1,350		)	(2,890		)	(1,491		)	(951		)	(166		)
Interest income	(925		)	(575		)	(328		)	(345		)	(1,976		)
Gain on extinguishment of debt (6)	—			—			—			(19,711		)	(53,673		)
Other expense	331			235			194			298			214
Total other expense (income)	(594		)	21,551			48,688			26,183			(15,356		)
Income before income taxes	174,584			122,831			20,185			85,226			33,647
Provision (benefit) for income taxes (7)	66,124			46,383			(52,296		)	1,533			388
Net income	$	108,460		$	76,448		$	72,481		$	83,693		$	33,259
Earnings Per Share:
Basic	$	1.50		$	1.44		$	2.77		$	3.23		$	1.29
Diluted	$	1.49		$	1.43		$	2.72		$	3.18		$	1.29
Weighted average shares outstanding:
Basic	72,385,574			53,240,898			26,183,772			25,910,766			25,780,070
Diluted	72,590,574			53,515,348			26,689,855			26,315,121			25,879,860

(1) We estimate that the 2010 pilot strike had a net negative impact on our operating income for 2010 of approximately $24 million consisting of an estimated $28 million in lost revenues and approximately $4 million of incremental costs resulting from the strike, offset in part by a reduction of variable expenses during the strike of approximately $8 million for flights not flown. Additionally, under the terms of the pilot contract, we also paid $2.3 million in return-to-work payments during the second quarter, which are not included in the strike impact costs described above.

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(2) Aircraft fuel expense is the sum of (i) “into-plane fuel cost,” which includes the cost of jet fuel and certain other charges such as fuel taxes and oil, (ii) settlement gains and losses and (iii) unrealized mark-to-market gains and losses associated with fuel hedge contracts. The following table summarizes the components of aircraft fuel expense for the periods presented:

	Year Ended December 31,
	2012		2011			2010			2009			2008 (*)
	(in thousands)
Into-plane fuel cost	$	471,542	$	392,278		$	251,754		$	181,806		$	359,097
Realized losses (gains)	175		(7,436		)	(1,483		)	750			(69,876		)
Unrealized losses (gains)	46		3,204			(2,065		)	(1,449		)	9,873
Aircraft fuel expense	$	471,763	$	388,046		$	248,206		$	181,107		$	299,094

(*) In July 2008, we monetized all of our fuel hedge contracts, which included hedges that had scheduled settlement dates during the remainder of 2008 and in 2009. We recognized a gain of $37.8 million representing cash received upon monetization of these contracts, of which a gain of $14.2 million related to 2009 fuel hedge positions on these contracts.

(3) Special charges (credits) include: (i) for 2008 and 2009, amounts relating to the early termination in mid-2008 of leases for seven Airbus A319 aircraft, a related reduction in workforce and the exit facility costs associated with returning planes to lessors in 2008; (ii) for 2009 and 2010, amounts relating to the sale of previously expensed MD-80 parts; (iii) for 2010 and 2011 amounts relating to exit facility costs associated with moving our Detroit, Michigan maintenance operations to Fort Lauderdale, Florida; (iv) termination costs in connection with the IPO during the three months ended June 30, 2011 comprised of amounts paid to Indigo Partners, LLC to terminate its professional services agreement with us and fees paid to three individual, unaffiliated holders of our subordinated notes; and (v) for 2011 and 2012, a $9.1 million gain related to the sale of four permanent air carrier slots at Ronald Reagan National Airport (DCA) offset by legal, accounting, printing, and filing fees connected with the 2012 secondary offerings. For more information, please see “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Our Operating Expenses—Special Charges (Credits).”

(4) Substantially all of the interest expense recorded in 2008, 2009, 2010 and 2011 relates to notes and preferred stock held by our principal stockholders that were repaid or redeemed, or exchanged for shares of common stock, in connection with the Recapitalization in 2011 that was effected in connection with the IPO. Interest expense in 2012 primarily relates to interest on pre-delivery deposits.

(5) Interest attributable to funds used to finance the acquisition of new aircraft, including PDPs is capitalized as an additional cost of the related asset. Interest is capitalized at the weighted average implicit lease rate of our aircraft.

(6) Gain on extinguishment of debt represents the recognition of contingencies provided for in our 2006 recapitalization agreements, which provided for the cancellation of shares of Class A preferred stock and reduction of the liquidation preference of the remaining Class A preferred stock and associated accrued but unpaid dividends based on the outcome of the contingencies.

(7) Net income for 2010 includes a $52.3 million net tax benefit primarily due to the release of a valuation allowance resulting in a deferred tax benefit of $52.8 million in 2010. Absent the release of the valuation allowance and corresponding tax benefit, our net income would have been $19.7 million for 2010.

The following table presents balance sheet data for the periods presented.

	As of December 31,
	2012		2011		2010			2009			2008
Balance Sheet Data:	(in thousands)
Cash and cash equivalents	$	416,816	$	343,328	$	82,714		$	86,147		$	16,229
Total assets	919,884		745,813		475,757			327,866			240,009
Long-term debt, including current portion	—		—		260,827			242,232			214,480
Mandatorily redeemable preferred stock	—		—		79,717			75,110			89,685
Stockholders' equity (deficit)	582,535		466,706		(105,077		)	(178,127		)	(261,890		)

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OPERATING STATISTICS

	Year Ended December 31,
	2012	2011	2010	2009	2008
Operating Statistics (unaudited) (A)
Average aircraft	41.2	34.8	30.5	28.0	32.8
Aircraft at end of period	45	37	32	28	28
Airports served in the period	52	48	39	43	45
Average daily Aircraft utilization (hours)	12.8	12.7	12.8	13.0	12.6
Average stage length (miles)	909	921	941	931	925
Block hours	192,403	161,898	141,864	133,227	150,827
Passenger flight segments (thousands)	10,423	8,518	6,952	6,325	6,976
Revenue passenger miles (RPMs) (thousands)	9,663,721	8,006,748	6,664,395	6,039,064	6,599,809
Available seat miles (ASMs) (thousands)	11,344,731	9,352,553	8,119,923	7,485,141	8,262,230
Load factor (%)	85.2	85.6	82.1	80.7	79.9
Average ticket revenue per passenger flight segment ($)	75.11	80.97	77.39	84.77	94.24
Average non-ticket revenue per passenger flight segment ($)	51.39	44.79	35.00	25.91	18.61
Total revenue per passenger segment ($)	126.50	125.76	112.39	110.68	112.85
Average yield (cents)	13.64	13.38	11.72	11.59	11.93
RASM (cents)	11.62	11.45	9.62	9.35	9.53
CASM (cents)	10.09	9.91	8.77	7.86	9.31
Adjusted CASM (cents) (B)	10.15	9.84	8.79	7.89	8.97
Adjusted CASM ex fuel (cents) (B)	6.00	5.72	5.71	5.45	5.47
Fuel gallons consumed (thousands)	142,991	121,030	106,628	98,422	109,562
Average economic fuel cost per gallon ($)	3.30	3.18	2.35	1.85	2.64

(A) See “Glossary of Airline Terms” elsewhere in this annual report for definitions of terms used in this table.

(B) Excludes special charges (credits) of $17.9 million (0.22 cents per ASM) in 2008, $(0.4) million (less than (0.01) cents per ASM) in 2009, $0.6 million (less than 0.01 cents per ASM) in 2010, $3.2 million (0.03 cents per ASM) in 2011, and $(8.5) million ((0.07) cents per ASM) in 2012. These amounts are excluded from all calculations of Adjusted CASM provided in this prospectus. Please see “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Our Operating Expenses—Special Charges (Credits).” Also excludes unrealized mark-to-market, or MTM, (gains) and losses of $9.9 million (0.12 cents per ASM) in 2008, $(1.4) million ((0.02) cents per ASM) in 2009, $(2.1) million ((0.03) cents per ASM) in 2010, $3.2 million (0.03 cents per ASM) in 2011, and $0.0 million (less than (0.01) cents per ASM) in 2012. Please see “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Critical Accounting Policies and Estimates.”

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ITEM 7.    MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

You should read the following discussion of our financial condition and results of operations in conjunction with the financial statements and the notes thereto included elsewhere in this annual report.

2012 Year in Review

The year 2012 proved to be one of the most successful years on record for the Company. We reported profitability for the sixth consecutive year, earning $108.5 million ($1.49 per share, diluted), compared to net income of $76.4 million ($1.43 per share, diluted) in 2011. Our continuous effort to preserve our low cost structure and to offer separately a range of optional services allowed us to offer low base fares which drove strong customer demand during 2012. In addition, our ability to adjust our capacity and routes in response to changing market conditions allowed us to increase our profitability year over year.

We achieved a 13.2% operating profit margin on $1.3 billion in operating revenues, despite an estimated $25 million in lost revenues caused by operational disruptions related to Hurricane Sandy. Our traffic grew by 20.7% as we continued to stimulate demand with low fares, evidenced by our ability to reduce our average ticket revenue per passenger flight segment by $5.86 or 7.2% to $75.11. In addition to the effect of the storm during 2012, we also experienced increases in energy prices as well as additional maintenance costs as a result of our seat maintenance program. Our fuel expense increased $83.7 million, or 21.6%, to $471.8 million during 2012 as compared to 2011 mainly as a result of our increased flight volume of 19.9% coupled with increases in fuel cost per gallon of 3.8% year over year. During 2012, we introduced and completed a new seat maintenance program which added $6.8 million in one-time start-up costs to maintenance expenses.

Our operating cost structure has been a primary area of focus since 2007, when we decided to compete solely on the basis of fare price and implemented our ULCC business model. Spirit's unit operating costs continue to be among the lowest of any airline in the Americas. During 2012, we expanded our fleet of Airbus single-aisle aircraft from 37 to 45. Our high-density seating configuration allows us to be the "greenest" major airline in the United States, because we burn less fuel per passenger than our competitors. We grew our capacity in 2012 by 21.3%, expanding into five new destinations - Phoenix/Mesa, Arizona; Denver, Colorado; Houston, Texas; Minneapolis/St. Paul, Minnesota; and Los Cabos, Mexico. In 2012, we announced the opening of crew and maintenance bases in Las Vegas, Nevada and in Dallas/Fort Worth, Texas to help support the expansion of our operation to destinations in the Western United States, and drive overall lower operating costs.

Driving increased ancillary revenue also continues to be a primary focus. In 2012, we increased our average non-ticket revenue per passenger flight segment by 14.7%, or $6.60, to $51.39. Our total non-ticket revenue increased by 40.4%, or $154.1 million, to $535.6 million in 2012. In late 2011, we increased our domestic passenger usage fee, while decreasing many of the corresponding base fares, which drove much of the increase in non-ticket revenue per passenger segment and the decrease in ticket revenue per passenger segment in 2012. In addition, we restructured our bag charges in an effort to encourage customers to pre-pay for bags on the website rather than at the airport or the gate. We also continued to grow non-ticket revenues by offering travel-related options such as hotels and rental cars for sale through our website, through our $9 Fare Club, and other options to enhance our customers' travel experience.

During 2012, our unit operating costs excluding fuel and special charges (credits) (Adjusted CASM excluding fuel) increased by 4.9% to 6.00 cents. The increase on a per-unit basis is primarily due to increases in maintenance costs, depreciation and amortization, and certain costs within other operating expenses. The increase in maintenance costs is due primarily to the one-time start-up costs of our seat maintenance program. The increase in depreciation and amortization is related to the increase in scheduled heavy maintenance events on our aircraft. We use the deferral method of accounting for scheduled heavy maintenance checks, and therefore, once the event is performed, we capitalize the associated costs and amortize the expense over time until the earlier of the end of the remaining lease term or until the next scheduled heavy maintenance event. Many of the markets we added in 2012, as well as the run-rate effect of those added during 2011, have higher average operating costs which, in addition to contributing to increases in other rents and landing fees, drove increases in station-related costs that are accounted for under other operating expenses. In addition, prior to our crew base openings in Las Vegas, Nevada and Dallas, Texas in 2012, our network scope changes drove higher crew-related expenses as result of increased hotel volumes at higher average rates. We also experienced higher passenger re-accommodation expenses associated with flight cancellations during 2012.

On December 2011, we signed a new agreement with Airbus for the delivery of 75 Airbus A320 aircraft. As of December 31, 2012, our firm order with Airbus (including under our old purchase agreement) and a third party consisted of 106 A320 family aircraft scheduled for delivery through 2021. Our plan calls for growing the fleet by 21.5% in 2013.

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2011 IPO

On June 1, 2011, we completed our initial public offering of common stock, or IPO, which raised net proceeds of $150.0 million after repayment of debt, payment of transaction expenses and other fees. In connection with the IPO, we effected a recapitalization, which we refer to as the 2011 Recapitalization, that resulted in the repayment or conversion of all of our notes and shares of preferred stock into shares of common stock.

2010 Pilot Strike

On May 13, 2010, the NMB released us and the pilots’ union from mandatory supervised mediation, which commenced a 30-day “cooling off” period as provided in the RLA. On June 12, 2010, following several negotiation sessions with the pilots’ union during the cooling off period that did not result in an agreement, our pilots declared a strike, and we were forced to suspend all flight operations. The parties reached a tentative agreement on June 16, 2010 under a Return to Work Agreement, and a full flight schedule was resumed on June 18, 2010. On July 23, 2010, the pilots ratified a five-year collective bargaining agreement that became effective on August 1, 2010.

The results of operations for 2010 were materially adversely affected by the pilot strike. The pilot strike resulted in reduced bookings in the period leading up to the strike as our customers became aware of the impending end of the cooling off period, and lost revenues while flight operations were shut down and while we recovered from the strike. We also experienced additional expenses related to the strike, including costs to reaccommodate passengers, offset by reduced variable expenses, such as reduced fuel consumption and employee costs for flights not operated. We estimate that the strike had a net negative impact on our operating income for 2010 of approximately $24 million, resulting from an estimated $28 million in lost revenues and approximately $4 million of incremental costs, offset in part by a reduction of variable expenses during the strike of approximately $8 million for flights not flown. The strike resulted in a reduction of approximately 145.8 million ASMs from our scheduled flying that was suspended during the five-day strike period. Additionally, under the terms of the pilot contract, we also paid $2.3 million in return-to-work payments during the second quarter of 2010, which are not included in the strike impact costs described above.

The agreement with our pilots increased our pilot labor costs by approximately 11% in 2011 compared to the estimated cost of the previous collective bargaining agreement and includes additional pay rate increases and modified work rules, which will increase the productivity of our pilots. We believe the five-year term is valuable in providing stability to our labor costs, and that the other terms will also provide us with competitive pilot labor costs compared to other U.S.-based low-cost carriers.

Our Operating Revenues

Our operating revenues are comprised of passenger revenues and non-ticket revenues.

Passenger Revenues. Passenger revenues consist of the base fares that customers pay for air travel, which fares include government-imposed taxes and fees.

Non-ticket Revenues. Non-ticket revenues are generated from air travel-related charges for baggage, bookings through our distribution channels, advance seat selection, itinerary changes, hotel travel packages, and loyalty programs such as our FREE SPIRIT affinity credit card program and $9 Fare Club. Non-ticket revenues also include revenues derived from services not directly related to providing transportation such as the sale of advertising to third parties on our website and on board our aircraft.

Substantially all of our revenues are denominated in U.S. dollars. Passenger revenues are recognized once the related flight departs. Accordingly, the value of tickets sold in advance of travel is included under our current liabilities as “air traffic liability,” or ATL, until the related air travel is provided. Non-ticket revenues are generally recognized at the time the ancillary products are purchased or ancillary services are provided. Non-ticket revenues also include revenues from our subscription-based $9 Fare Club, which we recognize on a straight-line basis over 12 months. Revenue is generated from the FREE SPIRIT credit card affinity program through the sale of FREE SPIRIT miles, card acquisitions, ongoing use of the FREE SPIRIT credit cards, milestone payments in connection with the achievement of specific usage and user volumes, and renewals, which we currently recognize in accordance with the criteria as set forth in Accounting Standards Update ASU No. 2009-13. Please see “—Critical Accounting Policies and Estimates—Frequent Flier Program”.

We recognize revenues net of certain taxes and airport passenger fees, which are collected by us on behalf of airports and governmental agencies and remitted to the applicable governmental entity or airport on a periodic basis. These taxes and fees include U.S. federal transportation taxes, federal security charges, airport passenger facility charges, and foreign arrival and departure taxes. These items are collected from customers at the time they purchase their tickets, but are not included in our

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revenues. We record a liability upon collection from the customer and relieve the liability when payments are remitted to the applicable governmental agency or airport.

Our Operating Expenses

Our operating expenses consist of the following line items.

Aircraft Fuel. Aircraft fuel expense is our single largest operating expense. It includes the cost of jet fuel, related federal taxes, fueling into-plane fees and transportation fees. It also includes realized and unrealized gains and losses arising from any fuel price hedging activity.

Salaries, Wages and Benefits. Salaries, wages and benefits expense includes the salaries, hourly wages, bonuses and equity compensation paid to employees for their services, as well as the related expenses associated with employee benefit plans and employer payroll taxes.

Aircraft Rent. Aircraft rent expense consists of monthly lease rents for aircraft and spare engines under the terms of the related operating leases and is recognized on a straight-line basis. Aircraft rent expense also includes that portion of maintenance reserves, also referred to as supplemental rent, paid to aircraft lessors in advance of the performance of major maintenance activities that is not probable of being reimbursed to us by the lessor. To the extent we had any return condition obligations which we believe are probable, those would be considered contingent rent and would be included within aircraft rent expense. Aircraft rent expense is net of the amortization of gains and losses on sale and leaseback transactions on our flight equipment. Presently, all of our aircraft and spare engines are financed under operating leases.

Landing Fees and Other Rents. Landing fees and other rents include both fixed and variable facilities expenses, such as the fees charged by airports for the use or lease of airport facilities, overfly fees paid to other countries and the monthly rent paid for our headquarters facility.

Distribution. Distribution expense includes all of our direct costs to sell, including the cost of web support, our third-party call center, travel agent commissions and related GDS fees, and credit card transaction fees, associated with the sale of our tickets and other products and services.

Maintenance, Materials and Repairs. Maintenance, materials and repairs expense includes all parts, materials, repairs and fees for repairs performed by third-party vendors directly required to maintain our fleet. It excludes direct labor cost related to our own mechanics, which is included under salaries, wages and benefits. It also excludes the amortization of heavy maintenance expenses, which we defer under the deferral method of accounting and amortize on a straight-line or usage basis until the next estimated overhaul event.

Depreciation and Amortization. Depreciation and amortization expense includes the depreciation of fixed assets we own and leasehold improvements. It also includes the amortization of heavy maintenance expenses we defer under the deferral method of accounting for heavy maintenance events and recognize into expense on a straight-line or usage basis until the next overhaul event.

Loss on Disposal of Assets. Loss on disposal of assets includes the net losses on the disposal of our fixed assets, including losses on sale and leaseback transactions.

Other Operating Expenses. Other operating expenses include airport operations expense and fees charged by third-party vendors for ground handling services and food and liquor supply service expenses, passenger re-accommodation expense, the cost of passenger liability and aircraft hull insurance, all other insurance policies except for employee health insurance, travel and training expenses for crews and ground personnel, professional fees, personal property taxes and all other administrative and operational overhead expenses. No individual item included in this category represented more than 5% of our total operating expenses.

Special Charges (Credits). Special charges (credits) include termination costs, restructuring costs, secondary offering costs, and the gain on the sale of take-off and landing slots.

In June 2012, we transferred four permanent air carrier slots at Ronald Reagan National Airport (“DCA”) to another airline for $9.1 million. Due to FAA regulations, the gain of $9.1 million was fully deferred at the time of the sale. The Company recognized the $9.1 million gain within special charges (credits) in the third quarter of 2012, the period in which the FAA operating restriction lapsed and written confirmation of the slot transfer was received by the buyer from the FAA. 

On July 31, 2012, certain stockholders affiliated with Oaktree Capital Management ("Oaktree") sold an aggregate of 9,394,927 shares of common stock in an underwritten public offering. The Company incurred a total of $0.7 million in costs

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during the year ended December 31, 2012 related to this offering. Upon completion of this secondary offering, investment funds affiliated with Oaktree owned no shares of our common stock.

Previously, on January 25, 2012, certain stockholders of the Company, including affiliates of Oaktree and Indigo Partners, LLC ("Indigo") and certain members of the Company's executive team, sold an aggregate of 12,650,000 shares of common stock in an underwritten public offering. The Company incurred a total of $1.3 million in costs between 2011 and 2012 related to this secondary offering, offset by reimbursements from certain selling shareholders of $0.6 million in accordance with the Fourth Amendment to the Second Amended and Restated Investor Rights Agreement.

The Company did not receive any proceeds from either of these secondary offerings.

In the second quarter of 2011, we incurred $2.3 million of termination costs in connection with the IPO comprised of amounts paid to Indigo to terminate its professional services agreement with us and fees paid to three individual, unaffiliated holders of our subordinated notes.

Our Other Expense (Income)

Interest Expense. Paid-in-kind interest on notes due to related parties and preferred stock dividends due to related parties account, on average, for over 80% of interest expense incurred for the years 2011 and 2010. Non-related party interest expense accounted for the remainder of interest expense in these periods. All of the notes and preferred stock were repaid or redeemed, or exchanged for common stock, in connection with the 2011 Recapitalization. Interest expense in 2012 primarily relates to interest on pre-delivery deposits.

Capitalized Interest. Capitalized interest represents interest cost to finance purchase deposits for future aircraft and the opportunity cost (interest) incurred during the acquisition period of an aircraft that theoretically could have been avoided had we not made PDPs for that aircraft. These amounts are recorded as part of the cost of the aircraft upon delivery. Capitalization of interest ceases when the asset is ready for service.

Our Income Taxes

We account for income taxes using the liability method. We record a valuation allowance to reduce the deferred tax assets reported if, based on the weight of the evidence, it is more likely than not that some portion or all of the deferred tax assets will not be realized. Deferred taxes are recorded based on differences between the financial statement basis and tax basis of assets and liabilities and available tax loss and credit carryforwards. In assessing the realizability of the deferred tax assets, we consider whether it is more likely than not that some or all of the deferred tax assets will be realized. In evaluating the ability to utilize our deferred tax assets, we consider all available evidence, both positive and negative, in determining future taxable income on a jurisdiction by jurisdiction basis.

Immediately prior to the IPO, we entered into the Tax Receivable Agreement and thereby distributed to the Pre-IPO Stockholders the right to receive such stockholders’ pro rata share of the future payments to be made by us under the Tax Receivable Agreement. Under the Tax Receivable Agreement, we are obligated to pay to the Pre-IPO Stockholders an amount equal to 90% of the cash savings in federal income tax realized by us by virtue of our future use of the federal net operating loss, deferred interest deductions and alternative minimum tax credits held by us as of March 31, 2011, which we refer to as the Pre-IPO NOL. “Deferred interest deductions” means interest deductions that have accrued as of March 31, 2011, but have been deferred under rules applicable to related party debt. Cash tax savings generally will be computed by comparing our actual federal income tax liability to the amount of such taxes that we would have been required to pay had such Pre-IPO NOLs not been available to us. Upon consummation of the IPO and execution of the TRA, the Company recorded a liability with an offsetting reduction to additional paid in capital.

The term of the TRA will continue until the first to occur of (a) the full payment of all amounts required under the agreement with respect to utilization or expiration of all of the Pre-IPO NOLs, (b) the end of the taxable year including the tenth anniversary of the IPO or (c) a change in control of the Company. The amount and timing of payments under the TRA will depend upon a number of factors, including, but not limited to, the amount and timing of taxable income generated in the future and any future limitations that may be imposed on the Company's ability to use the Pre-IPO NOLs. The Company paid $27.2 million, or 90% of the tax savings realized from the utilization of NOLs in 2011, including $0.3 million of applicable interest in 2012 related to the TRA. As of December 31, 2012 an estimated remaining cash benefit of $8.0 million is expected to be paid in 2013 to our Pre-IPO Stockholders under the terms of the TRA.

Trends and Uncertainties Affecting Our Business

We believe our operating and business performance is driven by various factors that affect airlines and their markets, trends affecting the broader travel industry, and trends affecting the specific markets and customer base that we target. The

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following key factors may affect our future performance.

Competition. The airline industry is highly competitive. The principal competitive factors in the airline industry are fare pricing, total price, flight schedules, aircraft type, passenger amenities, number of routes served from a city, customer service, safety record and reputation, code-sharing relationships, and frequent flier programs and redemption opportunities. Price competition occurs on a market-by-market basis through price discounts, changes in pricing structures, fare matching, target promotions and frequent flier initiatives. Airlines typically use discount fares and other promotions to stimulate traffic during normally slower travel periods to generate cash flow and to maximize unit revenue. The prevalence of discount fares can be particularly acute when a competitor has excess capacity that it is under financial pressure to sell.

Seasonality and Volatility. Our results of operations for any interim period are not necessarily indicative of those for the entire year because the air transportation business is subject to significant seasonal fluctuations. We generally expect demand to be greater in the second and third quarters compared to the rest of the year. The air transportation business is also volatile and highly affected by economic cycles and trends. Consumer confidence and discretionary spending, fear of terrorism or war, weakening economic conditions, fare initiatives, fluctuations in fuel prices, labor actions, changed in governmental regulations on taxes and fees, weather and other factors have resulted in significant fluctuations in revenues and results of operations in the past. We believe demand for business travel historically has been more sensitive to economic pressures than demand for low-price travel. Finally, a significant portion of our operations are concentrated in markets such as South Florida, the Caribbean, Latin America and the Northeast and northern Midwest regions of the United States, which are particularly vulnerable to weather, airport traffic constraints and other delays.

Aircraft Fuel. Fuel costs represent the single largest operating expense for most airlines, including ours. Fuel costs have been subject to wide price fluctuations in recent years. Fuel availability and pricing are also subject to refining capacity, periods of market surplus and shortage, and demand for heating oil, gasoline and other petroleum products, as well as meteorological, economic and political factors and events occurring throughout the world, which we can neither control nor accurately predict. We source a significant portion of our fuel from refining resources located in the southeast United States, particularly facilities adjacent to the Gulf of Mexico. Gulf Coast fuel is subject to volatility and supply disruptions, particularly in hurricane season when refinery shutdowns have occurred in recent years, or when the threat of weather-related disruptions has caused Gulf Coast fuel prices to spike above other regional sources. From time to time, we use fuel hedges using NYMEX WTI and U.S. Gulf Coast jet fuel collars as the underlying commodity to attempt to mitigate price volatility. Additionally, during peak hurricane season (August through October), we may enter into jet fuel swaps to protect the refining price risk between the price of crude oil and the price of refined jet fuel. Historically, we have protected approximately 70% of our forecasted fuel requirements during peak hurricane season using jet fuel swaps. Our fuel hedging practices are dependent upon many factors, including our assessment of market conditions for fuel, our access to the capital necessary to support margin requirements, the pricing of hedges and other derivative products in the market and applicable regulatory policies. As of December 31, 2012, the Company had agreements in place to protect $7.8 milliongallons or approximately 5% of its 2013 anticipated fuel consumption. As of December 31, 2012, we purchased all of our aircraft fuel under a single fuel service contract. The cost and future availability of jet fuel cannot be predicted with any degree of certainty.

Labor. The airline industry is heavily unionized. The wages, benefits and work rules of unionized airline industry employees are determined by collective bargaining agreements, or CBAs. Relations between air carriers and labor unions in the United States are governed by the RLA. Under the RLA, CBAs generally contain “amendable dates” rather than expiration dates, and the RLA requires that a carrier maintain the existing terms and conditions of employment following the amendable date through a multi-stage and usually lengthy series of bargaining processes overseen by the NMB. This process continues until either the parties have reached agreement on a new CBA, or the parties have been released to “self-help” by the NMB. In most circumstances, the RLA prohibits strikes; however, after release by the NMB, carriers and unions are free to engage in self-help measures such as strikes and lockouts.

We have three union-represented employee groups comprising approximately 54% of our employees at December 31, 2012. Our pilots are represented by the Airline Pilots Association, International, or ALPA, our flight attendants are represented by the Association of Flight Attendants, or AFA-CWA, and our flight dispatchers are represented by the Transport Workers Union of America, or TWU. Conflicts between airlines and their unions can lead to work slowdowns or stoppages. In June 2010, we experienced a five-day strike by our pilots, which caused us to shut down our flight operations. The strike ended as a result of our reaching a tentative agreement under a Return to Work Agreement and a full flight schedule was resumed on June 18, 2010. On August 1, 2010, we entered into a five-year collective bargaining agreement. We believe the five-year term is valuable in providing stability to our labor costs, and that the other terms will also provide us with competitive pilot labor costs compared to other U.S.-based low-cost carriers.

In addition, our CBA with our flight attendants became amendable under the RLA in 2007, and we are currently engaged in negotiations with the AFA-CWA. The outcome of our collective bargaining negotiations cannot presently be determined and

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the terms and conditions of our future CBAs may be affected by the results of collective bargaining negotiations at other airlines that may have a greater ability to bear higher costs under their business models. If we are unable to reach agreement with any of our unionized work groups in current or future negotiations regarding the terms of their CBAs, we may be subject to work interruptions or stoppages, such as the strike by our pilots in June 2010. A strike or other significant labor dispute with our unionized employees is likely to adversely affect our ability to conduct business.

MaintenanceExpense. Maintenance expense grew through 2012, 2011 and 2010 mainly as a result of the increasing age of our fleet (approximately 4.6 years on average at December 31, 2012) and growing fleet. As the fleet ages, we expect that maintenance costs will increase in absolute terms. The amount of total maintenance costs and related amortization of heavy maintenance expense is subject to many variables such as future utilization rates, average stage length, the size and makeup of the fleet in future periods and the level of unscheduled maintenance events and their actual costs. Accordingly, we cannot reliably quantify future maintenance expenses for any significant period of time. However, we believe, based on our scheduled maintenance events, current maintenance expense and maintenance-related amortization expense in 2013 will be approximately $90 million.

As a result of a significant portion of our fleet being acquired over a relatively short period of time, significant maintenance scheduled on each of our planes will occur at roughly the same time, meaning we will incur our most expensive scheduled maintenance obligations across our current fleet around the same time. These more significant maintenance activities will result in out-of-service periods during which our aircraft will be dedicated to maintenance activities and unavailable to fly revenue service. In addition, management expects that the final heavy maintenance events will be amortized over the remaining lease term rather than until the next estimated heavy maintenance event, because we account for heavy maintenance under the deferral method. Please see “—Critical Accounting Policies and Estimates—Aircraft Maintenance, Materials, Repair Costs and Related Heavy Maintenance Amortization.”  This will result in significantly higher depreciation and amortization expense related to heavy maintenance.

Maintenance Reserve Obligations. The terms of some of our aircraft lease agreements require us to pay supplemental rent, also known as maintenance reserves, to the lessor in advance of and as collateral for the performance of major maintenance events, resulting in our recording significant prepaid deposits on our balance sheet. As a result, the cash costs of scheduled major maintenance events are paid well in advance of the recognition of the maintenance event in our results of operations. Please see “—Critical Accounting Policies and Estimates—Aircraft Maintenance, Materials, Repair Costs and Related Heavy Maintenance Amortization” and “—Maintenance Reserves.”

Critical Accounting Policies and Estimates

The following discussion and analysis of our financial condition and results of operations is based on our consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States. The preparation of these financial statements requires us to make estimates and judgments that affect the reported amount of assets and liabilities, revenues and expenses, and related disclosure of contingent assets and liabilities at the date of our financial statements. Note 1 to our financial statements provides a detailed discussion of our significant accounting policies.

Critical accounting policies are defined as those policies that reflect significant judgments or estimates about matters that are both inherently uncertain and material to our financial condition or results of operations.

Revenue Recognition. Revenues from tickets sold are initially deferred as ATL. Passenger revenues are recognized when transportation is provided. An unused non-refundable ticket expires at the date of scheduled travel and is recognized as revenue for the expired ticket value at the date of scheduled travel.

Our most significant non-ticket revenues include revenues generated from air travel-related services paid for baggage, bookings through our call center or third-party vendors, advance seat selection, itinerary changes and loyalty programs, and are recognized at the time products are purchased or ancillary services are provided. These revenues also include commissions from the sales of hotel rooms, trip insurance and rental cars recognized at the time the service is rendered.

Customers may elect to change their itinerary prior to the date of departure. A service charge is assessed and recognized on the date the change is initiated and is deducted from the face value of the original purchase price of the ticket, and the original ticket becomes invalid. The amount remaining after deducting the service charge is called a credit shell which expires 60 days from the date the credit shell is created and can be used towards the purchase of a new ticket and the Company’s other service offerings. The amount of credits expected to expire is recognized as revenue upon issuance of the credit and is estimated based on historical experience. Estimating the amount of credits that will go unused involves some level of subjectivity and judgment.

Non-ticket revenues include revenues from our subscription-based $9 Fare Club, recognized on a straight-line basis over

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12 months. Revenues generated from the sale of FREE SPIRIT miles and credit card renewals are currently recognized on a straight-line basis over 16 months based on expected customer usage of miles. We make assumptions on the future use of customer miles based on historical customer behavior. To the extent that customer behavior changes as a result of, among other factors, economic conditions, perception of travel, and the number of miles to earn awards, a corresponding adjustment would be made to the period in which we recognize revenue generated from the FREE SPIRIT miles and credit card renewals, resulting in either a smaller or larger liability. Also included in non-ticket revenues are milestone payments in connection with the achievement of specific usage and user volumes, which we recognize when received from the FREE SPIRIT credit card provider.

Frequent Flier Program. We accrue for mileage credits earned through travel, including mileage credits for members with an insufficient number of mileage credits to earn an award, under our FREE SPIRIT program based on the estimated incremental cost of providing free travel for credits that are expected to be redeemed. Incremental costs include fuel, insurance, security, ticketing and facility charges reduced by an estimate of amounts required to be paid by the passenger when redeeming the award.

We also sell mileage credits to companies participating in the FREE SPIRIT program (or affinity card program). Under our original affinity card program, funds received from the sale of mileage credits were accounted for as a multiple-element arrangement and allocated to a marketing component and a transportation component (mileage credits) using the residual method. The fair value of the transportation component was deferred and recognized ratably as passenger revenue over the estimated period the transportation was expected to be provided. The difference between the funds received and the fair value of the transportation component was recognized in non-ticket revenue at the time of sale as non-ticket marketing revenue. The marketing component represented our compensation for, among many items, use of our trademark, customer lists and placement of marketing materials to encourage application for credit cards. Because there were no undelivered elements other than the mileage credits, we recorded the revenue from the marketing component when funds were received. We also received bonuses from companies participating in the FREE SPIRIT program that are driven by the volume of the usage of our co-branded credit cards. We recognized these bonuses as non-ticket revenue when payment is received (milestone method) as the milestones were substantive.

During the fourth quarter of 2010, the Company determined not to renew its agreement with the administrator of the FREE SPIRIT affinity credit card program at the scheduled expiration in February 2011. We entered into a new affinity card program that became effective April 1, 2011 for the marketing of a co-branded Spirit credit card and the delivery of award miles over a five-year period. At the inception of the arrangement, we evaluated all deliverables in the arrangement to determine whether they represent separate units of accounting. We determined the arrangement had three separate units of accounting: (i) travel miles to be awarded, (ii) licensing of brand and access to member lists, and (iii) advertising and marketing efforts. At inception of the arrangement, we established the relative selling price for all deliverables that qualified for separation, as arrangement consideration should be allocated based on relative selling price. The manner in which the selling price was established was based on the applicable hierarchy of evidence. Total arrangement consideration was then allocated to each deliverable on the basis of the deliverable's relative selling price. In considering the hierarchy of evidence, we first determined whether vendor-specific objective evidence of selling price or third-party evidence of selling price existed. We determined that neither vendor-specific objective evidence of selling price nor third-party evidence existed due to the uniqueness of our program. As such, we developed our best estimate of the selling price for all deliverables. For the selling price of travel, we considered a number of entity-specific factors including the number of miles needed to redeem an award, average fare of comparable segments, breakage, restrictions, and other charges. For licensing of brand and access to member lists, we considered both market-specific factors and entity-specific factors, including general profit margins realized in the marketplace/industry, brand power, market royalty rates, and size of customer base. For the advertising and marketing element, we considered market-specific factors and entity-specific factors including, our internal costs (and fluctuations of costs) of providing services, volume of marketing efforts, and overall advertising plan. Consideration allocated based on the relative selling price to both brand licensing and advertising elements is recognized as revenue when earned and recorded in non-ticket revenue. Consideration allocated to award miles is deferred and recognized ratably as passenger revenue over the estimated period the transportation is expected to be provided which is currently estimated at 16 months. We used entity-specific assumptions coupled with the various judgments necessary to determine the selling price of a deliverable in accordance with the required selling price hierarchy. Changes in these assumptions (e.g., cost of fare, number of miles to redeem awards, marketing plan, and approval rate of credit cards) could result in changes in the estimated selling prices. Determining the frequency to reassess selling price for individual deliverables requires significant judgment. For additional information, please see “Notes to Financial Statements—1. Summary of Significant Accounting Policies—Frequent Flier Program”.

Aircraft Maintenance, Materials, Repair Costs and Related Heavy Maintenance Amortization. We account for heavy maintenance under the deferral method. Under the deferral method the cost of heavy maintenance is capitalized and amortized as a component of depreciation and amortization expense until the earlier of the next estimated heavy maintenance event or the aircraft's return at the end of the lease term. Amortization of engine and aircraft overhaul costs was $9.1 million, $2.6 million,

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and $1.3 million for the years ended December 31, 2012, 2011, and 2010, respectively. If heavy maintenance costs were amortized within maintenance, material and repairs expense in the statement of operations, our maintenance, material and repairs expense would have been $58.6 million, $38.1 million, and $29.5 million for the years ended December 31, 2012, 2011, and 2010, respectively. During the years ended December 31, 2012, 2011, and 2010, we capitalized $61.6 million, $22.1 million, and $5.2 million of costs for heavy maintenance, respectively. The timing of the next heavy maintenance event is estimated based on assumptions including estimated usage, FAA-mandated maintenance intervals and average removal times as suggested by the manufacturer. These assumptions may change based on changes in our utilization of our aircraft, changes in government regulations and suggested manufacturer maintenance intervals. In addition, these assumptions can be affected by unplanned incidents that could damage an airframe, engine, or major component to a level that would require a heavy maintenance event prior to a scheduled maintenance event. To the extent our planned usage increases, the estimated life would decrease before the next maintenance event, resulting in additional expense over a shorter period. Heavy maintenance events are our 6-year and 12-year airframe checks (HMV4 and HMV8, respectively), engine overhauls, and overhauls to major components. Certain maintenance functions are outsourced under contracts that require payment based on a performance measure such as flight hours. Costs incurred for maintenance and repair under flight hour maintenance contracts, where labor and materials price risks have been transferred to the service provider, are accrued based on contractual payment terms. Routine cost for maintaining the airframes and engines and line maintenance are charged to maintenance, materials and repairs expense as performed.

Maintenance Reserves. Some of our master lease agreements provide that we pay maintenance reserves to aircraft lessors to be held as collateral in advance of our performance of major maintenance activities. These lease agreements provide that maintenance reserves are reimbursable to us upon completion of the maintenance event in an amount equal to the lesser of (1) the amount of the maintenance reserve held by the lessor associated with the specific maintenance event or (2) the qualifying costs related to the specific maintenance event. Substantially all of these maintenance reserve payments are calculated based on a utilization measure, such as flight hours or cycles, and are used solely to collateralize the lessor for maintenance time run off the aircraft until the completion of the maintenance of the aircraft. We paid $31.6 million, $38.3 million and $35.7 million in maintenance reserves, net of reimbursement, to our lessors for the years ended December 31, 2012, 2011, and 2010, respectively.

At lease inception and at each balance sheet date, we assess whether the maintenance reserve payments required by the master lease agreements are substantively and contractually related to the maintenance of the leased asset. Maintenance reserve payments that are substantively and contractually related to the maintenance of the leased asset are accounted for as maintenance deposits. Maintenance deposits expected to be recovered from lessors are reflected as prepaid maintenance deposits in the accompanying balance sheets. When it is not probable we will recover amounts currently on deposit with a lessor, such amounts are expensed as supplemental rent. Because we we are required to pay maintenance reserves for our operating leased aircraft, and we chose to apply the deferral method for maintenance accounting, management expects that the final heavy maintenance events will be amortized over the remaining lease term rather than over the next estimated heavy maintenance event. As a result, our maintenance costs in the last few years of leases could be significantly in excess of the costs in earlier periods. In addition these late periods could include additional costs from unrecoverable maintenance reserve payments required in the late years of the lease. We expensed $2.0 million, $1.5 million, and $0.0 million of maintenance reserves as supplemental rent during 2012, 2011, and 2010, respectively.

As of December 31, 2012, 2011, and 2010, we had prepaid maintenance deposits of $198.5 million, $168.8 million and $132.0 million, respectively, on our balance sheets. We have concluded that these prepaid maintenance deposits are probable of recovery primarily due to the rate differential between the maintenance reserve payments and the expected cost for the related next maintenance event that the reserves serve to collateralize.

These master lease agreements also provide that most maintenance reserves held by the lessor at the expiration of the lease are nonrefundable to us and will be retained by the lessor. Consequently, we have determined that any usage-based maintenance reserve payments after the last major maintenance event are not substantively related to the maintenance of the leased asset and therefore are accounted for as contingent rent. We accrue contingent rent beginning when it becomes probable and reasonably estimable we will incur such nonrefundable maintenance reserve payments. We make certain assumptions at the inception of the lease and at each balance sheet date to determine the recoverability of maintenance deposits. These assumptions are based on various factors such as the estimated time between the maintenance events, the cost of future maintenance events and the number of flight hours the aircraft is estimated to be utilized before it is returned to the lessor. Maintenance reserves held by lessors that are refundable to us at the expiration of the lease are accounted for as prepaid maintenance deposits on the balance sheet when they are paid.

RESULTS OF OPERATIONS

In 2012, we achieved a 13.2% operating margin, down by 0.3 points compared to 2011, mostly driven by approximately

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$25 million in lost revenues from the impact of Hurricane Sandy in the fourth quarter of 2012. In 2012, we generated pre-tax earnings of $174.6 million and net earnings of $108.5 million on operating revenues of $1,318.4 million. For 2011, we generated pre-tax earnings of $122.8 million and net earnings of $76.4 million on operating revenues of 1,071.2 million and achieved a 13.5% operating margin. Cash and cash equivalents increased by 73.5 million in 2012 compared to the prior year, and as of December 31, 2012, we had cash and cash equivalents of $416.8 million.

The increase in operating income in 2012 over 2011 of $29.6 million, or 20.5%, is mainly due to a 23.1%increase in revenue partially offset by increased fuel and other expenses. Revenue increased year over year as a result of a 21.3%increase in capacity and a 1.9% improvement in average yield. Fuel costs increased by $83.7 million during 2012 compared to 2011, primarily driven by an 18.1%increase in consumption. Operating expenses increased primarily due to our growth in capacity resulting from the addition of eight aircraft to our fleet and our route network expansion.

In 2011, we improved our liquidity position with the completion of an IPO in June, whereby we retained $150.0 million of net proceeds, after paying off debt, fees and costs associated with the offering. We recorded operating income in 2011 of $144.4 million on $1,071.2 million of operating revenues. Capacity growth and increased load factor in 2011 drove the increase in revenue over 2010 and was partially offset by increased fuel prices and increases in various other operating costs.

Net income for 2010 of $72.5 million includes a $52.3 million net tax benefit primarily due to the release of a valuation allowance resulting in a deferred tax benefit of $52.8 million in 2010. Absent the release of the valuation allowance and corresponding tax benefit, our net income would have been $19.7 million for 2010. In 2010, we recorded operating income of $68.9 million on $781.3 million of operating revenues. The results of operations for 2010 were adversely affected by an increase in fuel prices and the effects of our June 2010 pilot strike.

Operating Revenue

	Year Ended 2012		% change 2012 versus 2011	Year Ended 2011		% change 2011 versus 2010	Year Ended 2010
Passenger	$	782,792	13.5%	$	689,650	28.2%	$	537,969
Non-ticket	535,596		40.4%	381,536		56.8%	243,296
Total operating revenue	$	1,318,388	23.1%	$	1,071,186	37.1%	$	781,265
RASM (cents)	11.62		1.5%	11.45		19.1%	9.62
Average ticket revenue per passenger flight segment	$	75.11	(7.2)%	$	80.97	4.6%	$	77.39
Average non-ticket revenue per passenger flight segment	$	51.39	14.7%	$	44.79	28.0%	35.00
Total revenue per passenger flight segment	$	126.50	0.6%	$	125.76	11.9%	$	112.39

Non-ticket revenues comprise 40.6% of our total revenue for fiscal 2012 due to the effect of unbundling our fares and the introduction of new services beyond the sale of a ticket for transportation.

2012 compared to 2011

Operating revenue increased by $247.2 million, or 23.1%, to $1,318.4 million in 2012 compared to the prior year period as we increased traffic by 20.7% and improved our yield by 1.9% to 13.64 cents.

Our results for the year endedDecember 31, 2012 were driven by growing capacity 21.3% compared to the prior year period while maintaining a high load factor of 85.2% and a network reorientation in mid-2011 that added capacity in Dallas-Fort Worth, Chicago and Las Vegas. In October 2012, we canceled 136 flights, or 19.9 million available seat miles, as a result of adverse weather conditions and airport closures in connection with Hurricane Sandy. The negative impact of the storm on 2012 revenue was approximately $25 million. We generated greater demand in 2012 by lowering our average ticket revenue per passenger flight segment to $75.11, or by 7.2% compared to the prior year period, while increasing our non-ticket revenue per passenger flight segment from $44.79 to $51.39, a 14.7%increase compared to the prior year period. Total revenue per passenger flight segment increased 0.6% from $125.76 in 2011 to $126.50 in 2012.

We experienced a 40.4%increase in non-ticket revenues in 2012 compared to 2011, reflecting the continued development and optimization of ancillary revenues and a 22.4%increase in passenger flight segments. During the fourth quarter of 2011 and continuing into 2012, we further standardized our passenger usage fee across all markets and fare classes, which drove much of the increases in non-ticket revenue in 2012 compared to 2011. Non-ticket revenue represented 40.6% of total revenue in the year endedDecember 31, 2012 compared to 35.6% in the same period of 2011.

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2011 compared to 2010

Operating revenues increased by $289.9 million, or 37.1%, to $1,071.2 million in 2011 compared to $781.3 million in 2010. Our capacity in terms of ASMs increased 15.2% during 2011 compared to 2010, primarily driven by the addition of Airbus 320 aircraft, five of which were delivered during 2011, and the full-year effect of our four 2010 deliveries. Our traffic as measured in terms of RPMs increased by 20.1% during 2011 compared to 2010. Our aircraft operated an average of 12.7 hours daily with 85.6% of the seats full during 2011 compared to an average of 12.8 hours daily with 82.1% of the seats full during 2010.

Within operating revenues, passenger ticket revenue increased by 28.2% to $689.7 million in 2011 compared to $538.0 million in 2010. This increase was driven primarily by a 22.5%increase in passenger segments in 2011 compared to 2010.

Non-ticket revenues increased by $138.2 million in 2011 compared to 2010, a 56.8%increase primarily driven by the 22.5%increase in passenger flight segments and price enhancements on non-ticket services. During the first quarter of 2011, we reduced the weight threshold for overweight baggage from 50 pounds to 40 pounds and increased the amount charged to customers for modifying or canceling their reservations. During the second quarter of 2011, we increased bag rates purchased at check-in on the web, the airport, and at the kiosk. During the second half of 2011, we began our efforts to standardize our passenger usage fee across all markets and fare classes. As a result of experienced continued growth in revenue from many previously adopted non-ticket revenue initiatives, our non-ticket revenue per passenger flight segment increased 28.0% to $44.79 for 2011 from $35.00 for 2010.

Effective April 1, 2011, we entered into a new five-year affinity card program for the issuance of our FREE SPIRIT credit cards with a new administrator. During 2010, we determined not to renew our agreement with the former administrator of our FREE SPIRIT affinity credit card program at the scheduled expiration in February 2011. In connection with that non-renewal, we entered into an agreement with the former administrator regarding the transition of the program to the new provider and the remittance to us of compensation due to us for card members obtained through our marketing services in the amount of $5.0 million, of which $0.4 million was recognized in the first quarter of 2011 and $4.6 million was recognized in the fourth quarter of 2010.

Operating Expenses

Since adopting our ultra low-cost model, we have continuously sought to reduce our unit operating costs and have created what we believe is one of the lowest cost structures in our industry in the Americas. The table below presents our operating expenses, as a percentage of operating revenue for the last three years, as well as unit operating costs (CASM).

	Year Ended December 31,
	2012					2011					2010
	% of Revenue		CASM			% of Revenue		CASM			% of Revenue		CASM
Operating revenue	100.0	%				100.0	%				100.0	%
Operating expenses:
Aircraft fuel (1)	35.8	%		4.16	¢	36.2	%		4.15	¢	31.8	%		3.06	¢
Salaries, wages, and benefits	16.6		1.93			17.0		1.94			20.0		1.93
Aircraft rent	10.9		1.27			10.9		1.25			13.0		1.25
Landing fees and other rentals	5.2		0.60			4.9		0.56			6.2		0.59
Distribution	4.3		0.50			4.8		0.55			5.3		0.51
Maintenance, materials and repairs	3.8		0.44			3.3		0.38			3.6		0.35
Depreciation and amortization	1.2		0.13			0.7		0.08			0.7		0.07
Other operating expenses	9.7		1.13			8.4		0.96			10.6		1.02
Loss on disposal of assets	0.1		0.01			—		—			—		—
Special charges (credits) (2)	(0.6	)	(0.07		)	0.3		0.03			0.1		0.01
Total operating expense	86.8	%				86.5	%				91.2	%
CASM				10.09	¢				9.91	¢				8.77	¢
MTM losses (gains)per ASM			—					0.03					0.03
Special charges (credits) per ASM			(0.07		)			0.03					0.01
Adjusted CASM (excludes Special charges (credits) and MTM gains (losses))			10.15					9.84					8.79
Adjusted CASM excluding fuel			6.00					5.72					5.71

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(1) Aircraft fuel expense is the sum of (i) “into-plane fuel cost,” which includes the cost of jet fuel and certain other charges such as fuel taxes and oil, (ii) settlement gains and losses, and (iii) unrealized mark-to-market gains and losses associated with fuel hedge contracts. The following table summarizes the components of aircraft fuel expense for the periods presented:

	Year Ended December 31,
	2012		2011			2010
	(in thousands)
Into-plane fuel cost	$	471,542	$	392,278		$	251,754
Settlement losses (gains)	175		(7,436		)	(1,483		)
Unrealized mark-to-market losses (gains)	46		3,204			(2,065		)
Aircraft fuel	$	471,763	$	388,046		$	248,206

(2) Includes special charges (credits) of $(8.5) million ((0.07) cents per ASM) in 2012, $3.2 million (0.03 cents per ASM) in 2011 and $0.6 million (less than 0.01 cents per ASM) in 2010. Special charges (credits) for 2012 primarily include a $9.1 million gain related to the sale of four permanent air carrier slots at Ronald Reagan National Airport (DCA), offset by $0.6 million in secondary offering costs. Special charges (credits) for 2011 include $2.3 million of termination costs in connection with the IPO comprised of amounts paid to Indigo Partners, LLC to terminate its professional services agreement with us and fees paid to three individual, unaffiliated holders of our subordinated notes and in the fourth quarter include legal, accounting, printing, and filing fees connected with the secondary offering which was consummated on January 25, 2012. Special charges (credits) for 2010 include exit facility costs associated with amounts relating to the sale of previously-expensed MD-80 parts and exit facility costs associated with moving our Detroit, Michigan maintenance activities to Fort Lauderdale, Florida. Please see “—Our Operating Expenses—Special Charges (Credits).”

2012 compared to 2011

Operating expense increased by $217.6 million for 2012 compared to the prior year period mostly due to increases in fuel and labor costs, which were primarily driven by our 21.3% capacity growth, in addition to increases in other operating costs.

Our adjusted CASM ex fuel for 2012 increased by 4.9% as compared to the same period in 2011. During 2012, we incurred higher other operating expenses driven by higher costs associated with passenger re-accommodations related to slightly higher flight cancellations. Additionally, overall increased rates at the airports resulted in increased variable operating costs such as ground handling expenses and travel and lodging expense. During 2012, we also incurred an increase in maintenance costs related to our seat maintenance program and an increase in deferred heavy aircraft maintenance events, which in turn resulted in higher heavy maintenance amortization expense. Our average stage length for 2012decreased by 1.3%, contributing to the year-over-year increase in adjusted CASM ex fuel.

Aircraft fuel expenses includes both into-plane expense (as defined below) plus the effect of mark-to-market adjustments to our portfolio of derivative instruments, which is a component of aircraft fuel expenses. Into-plane fuel expense is defined as the price that we generally pay at the airport, or the “into-plane” price, including taxes and fees. Into-plane fuel prices are affected by world oil prices and refining costs, which can vary by region in the United States and the other countries where we operate. Both fuel consumption and prices increased during 2012. Into-plane fuel expense approximates cash paid to the supplier and does not reflect the effect of our fuel derivatives. Because our fuel derivative contracts do not qualify for hedge accounting, we recognize both realized and unrealized changes in the fair value of our derivatives when they occur as a component of aircraft fuel expense.

We evaluate economic fuel expense, which we define as into-plane fuel expense excluding the cash we receive from or pay to counterparties for hedges that we settle during the relevant period, including hedges that we terminate early during the period. The key difference between aircraft fuel expense and economic fuel expense is the timing of gain or loss recognition on our hedge portfolio. When we refer to economic fuel expense, we include net settlement gains or losses only when they are realized through a cash payment from our derivative contract counterparties for those contracts that were settled during the period. We believe this is the best measure of the effect that fuel prices are currently having on our business because it most closely approximates the net cash outflow associated with purchasing fuel for our operations. Accordingly, many industry analysts also evaluate airline results using this measure, and it is frequently used in our internal management reporting.

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Aircraft fuel expense increased from $388.0 million in 2011 to $471.8 million in 2012, representing 41.2% of our total operating expenses for that 2012 period. The increase was primarily due to an 18.1%increase in fuel gallons consumed as well as a 3.8%increase in fuel prices.

The difference between aircraft fuel expense and economic fuel expense and the elements of the changes are illustrated in the following table:

	Year Ended December 31,					Percent Change
	2012		2011
	(in thousands, except per-gallon amounts)
Into-plane fuel expense	$	471,542	$	392,278		20.2	%
Cash received from settled derivatives, net of cash settlements paid	175		(7,436		)	(102.4	)%
Economic fuel expense	471,717		384,842			22.6	%
Impact on fuel expense from unrealized (gains) and losses arising from mark-to-market adjustments to our outstanding fuel derivatives	46		3,204			(98.6	)%
Aircraft fuel expense (per Statement of Operations)	$	471,763	$	388,046		21.6	%
Fuel gallons consumed	142,991		121,030			18.1	%
Economic fuel cost per gallon	$	3.30	$	3.18		3.8	%
Into-plane fuel cost per gallon	$	3.30	$	3.24		1.9	%

Fuel gallons consumed increased 18.1% as a result of increased operations, as evidenced by an 18.8%increase in block hours. Our average daily aircraft utilization in 2012increased slightly compared to the prior year period. We estimate the fuel savings related to the 136 flights cancellations due to Hurricane Sandy were approximately $0.6 million.

Total net loss recognized for hedges that settled during 2012 was $0.2 million, compared to a net gain of $7.4 million in the prior year period. These amounts represent the net cash paid (received) for the settlement of hedges.

Labor costs in 2012increased by $37.2 million, or 20.5%, compared to 2011, primarily driven by a 22.4% increase in our pilot and flight attendant workforce as we increased our fleet size by 21.6%, or eight aircraft, during 2012. During 2012, we incurred an incremental $3.8 million of share-based compensation recorded within salaries, wages and benefits, driven primarily by the commencement of the Performance Share Awards program in 2012.

During 2012, aircraft rent increased $27.1 million, or 23.3%, mainly due to the delivery of eight Airbus A320 aircraft subsequent to the fourth quarter of 2011. All aircraft were financed through operating leases. The increase of aircraft rent expense on a per-ASM basis is primarily due to the fact that we incurred $2.5 million of additional aircraft rent during 2012 related to a short-term lease agreement with a third-party provider (wet-leased aircraft) to maintain desired capacity during the summer months.

Landing fees and other rents for 2012increased by $15.6 million, or 29.5%, compared to 2011 primarily due to a 19.9%increase in departures. On a per-ASM basis, the increase in landing fees and other rents of 7.1% during 2012 as compared to the prior year period is due to increased volume at higher-cost airports, including the addition of six new airports served in 2012, which on average are higher-cost airports than the system average.

The increase in distribution expense of $5.3 million, or 10.4%, in 2012 compared to 2011 was primarily due to increased volume and an increase of approximately 4.1 percentage points year-over-year in the percentage of sales from third-party travel agents, which are more expensive than sales directly through our website. This shift in distribution mix did not materially affect operating income because the revenues received from sales through third-party travel agents are designed to at least offset the associated incremental costs. The decrease on a per-unit basis is primarily due to a decrease of approximately 14% in credit card fee rates period over period.

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The following table shows our distribution channel usage:

	Year Ended December 31,
	2012		2011		Change
Website	64.2	%	66.3	%	(2.1	)
Third-party travel agents	27.2		23.1		4.1
Call center	8.6		10.6		(2.0	)

Maintenance, materials and repair costs increased by $15.4 million, or 45.4%, in 2012. The increase in maintenance costs is primarily due to $6.8 million in one-time start-up costs of the seat maintenance program, which was introduced and completed in 2012. We do not expect the ongoing expense of our seat maintenance program to have a material impact on our overall future maintenance cost outlook. The average age of our fleet increased to 4.6 years as of December 31, 2012 from 4.5 years as of December 31, 2011. Maintenance expense is expected to increase significantly as our fleet continues to age, resulting in the need for additional repairs over time.

Depreciation and amortization increased by $7.5 million, or 96.6%, primarily due to deferred heavy aircraft maintenance events, which in turn resulted in higher amortization expense recorded in 2012 compared to the prior year period.

Other operating expenses in 2012increased by $36.7 million, or 40.3%, compared to 2011 primarily due to an increase in departures of 19.9%. Overall increased rates at the airports we serve resulted in increased variable operating costs such as ground handling expenses and travel and lodging expense in 2012 compared to the prior year. The increase on a per-ASM basis of 17.7% is primarily due to a shift in our route network to include higher volumes at the higher-cost airports we serve. In addition, we experienced increases in travel and lodging costs driven by both volume and hotel rate increases associated with increased training and scope of operations, as well as higher passenger re-accommodation expenses associated with slightly higher flight cancellations during 2012. We also incurred additional expenses related to the implementation of an Enterprise Resource Planning (ERP) system.

Special charges (credits) for 2012 primarily include a $9.1 million gain related to the sale of four permanent air carrier slots at Ronald Reagan National Airport (DCA), offset by $0.6 million in secondary offering costs. Special charges (credits) for 2011 relate to termination costs of $2.6 million in connection with our IPO, including $1.8 million paid to Indigo Partners, LLC to terminate its professional services agreement with us and $0.5 million paid to three individual, unaffiliated holders of our subordinated notes.

2011 compared to 2010

Our operating expenses increased by $214.4 million, or 30.1%, for 2011 compared to the corresponding period in 2010. The increase is primarily related to a 56.3%increase in fuel costs, 16.2%increase in labor cost, and a 14.9%increase in aircraft rent.

Aircraft fuel expense for 2011increased $139.8 million, or 56.3%, compared to the prior year period due to a 35.3%increase in the average price of aircraft fuel per gallon and a 13.5%increase in gallons consumed. Aircraft fuel expense represented 41.9% of our total operating expenses for 2011.

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The difference between aircraft fuel expense and economic fuel expense and the elements of the changes are illustrated in the following table:

	Year Ended December 31,						Percent Change
	2011			2010
	(in thousands, except per-gallon amounts)
Into-plane fuel expense	$	392,278		$	251,754		55.8	%
Cash received from settled derivatives, net of cash settlements paid	(7,436		)	(1,483		)	401.4	%
Economic fuel expense	384,842			250,271			53.8	%
Impact on fuel expense from unrealized (gains) and losses arising from mark-to-market adjustments to our outstanding fuel derivatives	3,204			(2,065		)	(255.2	)%
Aircraft fuel expense (per Statement of Operations)	$	388,046		$	248,206		56.3	%
Fuel gallons consumed	121,030			106,628			13.5	%
Economic fuel cost per gallon	$	3.18		$	2.35		35.3	%
Into-plane fuel cost per gallon	$	3.24		$	2.36		37.3	%

Labor costs for 2011increased by $25.3 million, or 16.2%, compared to 2010, primarily due to increased headcount and increased pilot rates. Our pilot and flight attendant headcount increased 10% and 16%, respectively, as we increased our fleet size by 15.6% via the addition of five aircraft during 2011. The increase in labor costs was also driven by the increase in pilot labor rates by approximately 11% during 2011.

Aircraft rent expense for 2011increased by $15.1 million, or 14.9%, compared to 2010 mainly due to taking delivery of five Airbus A320 aircraft which were financed via operating leases. In addition, approximately $1.5 million in maintenance reserves were expensed as supplemental rent in 2011 as it was deemed they would not be reimbursed.

Distribution expense for 2011increased by $10.2 million, or 24.7%, compared to 2010, primarily due to increased credit card fees driven by the 37.1%increase in revenue. Additionally, there was a shift in the percentage of bookings made from our website to more expensive third-party distribution channels (GDSs), which increased to approximately 23.1% in 2011 from approximately 15.1% in 2010. This shift also drove the increase in distribution expense on a per unit basis, along with the increase in credit card fees per unit due to the growth in revenues outpacing the growth in units year over year. The following table shows our distribution channel usage:

	Year Ended December 31,
	2011		2010		Change
Website	66.3	%	75.2	%	(8.9	)
Third-party travel agents	23.1		15.1		8.0
Call center	10.6		9.7		0.9

Maintenance, materials and repair costs for 2011increased by $7.0 million, or 25.8%, compared to 2010. This increase was primarily due to a 31.7% increase in flight-hour-based maintenance expenses driven by higher flight hours. Non-flight-hour based maintenance increased 16.3% as a result of the timing of scheduled maintenance events and the aging fleet. As the fleet ages, we expect that maintenance costs and related out of service time to complete the maintenance will increase.

The increase in capacity during 2011 resulted in increased landing fees and other operating expenses in 2011 compared to 2010.

Other operating expenses for 2011increased by $7.4 million, or 8.9%, compared to 2010 and are generally driven by the increase in capacity, new stations start-ups, and increases in rates. We experienced notable increases in ground handling and crew travel and lodging cost partly due to increased flights and the changes in route mix. These increases in cost were offset by a decrease in costs incurred to accommodate displaced passengers due to the aggressive management of cost and strict adherence to our accommodation policy.

Special charges (credits) for 2011increased by $2.6 million, or 412.7%, compared to 2010 due to termination costs incurred in connection with the IPO during the second quarter of 2011, comprised of $1.8 million paid to Indigo Partners, LLC

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to terminate its professional services agreement with us and $0.5 million paid to three individual, unaffiliated holders of our subordinated notes.

Other (income) expense, net

2012 compared to 2011

Other (income) expense, net decreased by $22.1 million to $0.6 million net income for 2012 from $21.6 million net expense for 2011. Interest expense and corresponding capitalized interest in 2012 and 2011 primarily relates to interest on pre-delivery deposits and interest related to the TRA.

2011 compared to 2010

Other (income) expense, net decreased by $27.1 million to $21.6 million net expense for 2011 from $48.7 million net expense for 2010. The decrease is primarily related to interest on debt for only five months in 2011 compared to a full year in 2010 as a result of the elimination of our debt in conjunction with the IPO in June of 2011. Related-party interest expense incurred during 2011 and 2010 was $21.0 million and $44.6 million, respectively, and consisted primarily of paid-in-kind interest on notes and preferred stock dividends due to related parties. Non-related party interest expense during 2011 and 2010 was $3.8 million and $5.7 million, respectively.

Income Taxes

As of December 31, 2012, the Company has fully utilized an alternative minimum tax (“AMT”) credit carryforward of approximately $3.2 million and federal net operating losses (“NOLs”) of approximately $20.8 million against federal taxable income. In addition, as of December 31, 2012 and 2011, we had state NOLs of approximately $2.2 million and $9.1 million, respectively, which can be used to offset future state taxable income. State net operating losses begin to expire in 2017. The effective tax rate for 2012 was approximately 37.9% compared to 37.8% in the prior year period.

At December 31, 2009, we had recorded a full valuation allowance against existing net deferred tax assets. As of September 30, 2010, we determined that, under generally accepted accounting principles, the valuation allowance should be reduced by $53.5 million, which we recognized as a deferred tax benefit.

Immediately prior to the IPO, we entered into the Tax Receivable Agreement and thereby distributed to the Pre-IPO Stockholders the right to receive a pro rata share of the future payments to be made under such agreement. These future payments to the Pre-IPO Stockholders will be in an amount equal to 90% of the cash savings in federal income tax realized by us by virtue of our future use of federal NOL, deferred interest deductions and certain tax credits held by us as of March 31, 2011. Please see “Certain Relationships and Related Transactions—Tax Receivable Agreement.”

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Quarterly Financial Data (unaudited)

	Three Months Ended
	March 31, 2011		June 30, 2011		September 30, 2011		December 31, 2011		March 31, 2012		June 30, 2012		September 30, 2012		December 31, 2012
	(in thousands except share and per share amounts)
Total operating revenue	$	232,662	$	275,891	$	288,714	$	273,919	$	301,495	$	346,308	$	342,317	$	328,268
Passenger	153,280		180,418		186,682		169,270		180,078		211,812		202,181		188,721
Non-ticket	79,382		95,473		102,032		104,649		121,417		134,496		140,136		139,547
Operating income	26,844		34,959		44,556		38,023		37,244		55,132		49,681		31,933
Net income (loss)	$	7,883	$	16,917	$	27,657	$	23,991	$	23,419	$	34,591	30,884		19,566
Earnings Per Share:
Basic	$	0.30	$	0.41	$	0.38	$	0.33	$	0.32	$	0.48	$	0.43	$	0.27
Diluted	$	0.30	$	0.41	$	0.38	$	0.33	$	0.32	$	0.48	$	0.43	$	0.27
Weighted average shares outstanding
Basic	26,347,875		41,493,312		72,175,478		72,242,360		72,292,164		72,379,185		72,427,490		72,442,183
Diluted	26,689,151		41,769,049		72,427,286		72,472,524		72,498,705		72,583,690		72,658,298		72,622,718

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	Three Months Ended
	March 31, 2011	June 30, 2011	September 30, 2011	December 31, 2011	March 31, 2012	June 30, 2012	September 30, 2012	December 31, 2012
Other operating statistics
Aircraft at end of period	35	35	35	37	40	42	42	45
Airports served	44	45	47	48	50	51	52	51
Average daily Aircraft utilization (hours)	12.6	13.1	12.9	12.3	12.8	12.9	12.8	12.6
Average stage length (miles)	961	932	909	885	912	902	892	932
Passenger flight segments (thousands)	1,863	2,200	2,285	2,170	2,349	2,613	2,814	2,647
Revenue passenger miles (RPMs) (thousands)	1,847,280	2,083,804	2,109,119	1,966,545	2,194,350	2,397,663	2,552,316	2,519,392
Available seat miles (ASMs) (thousands)	2,200,097	2,425,642	2,422,962	2,303,852	2,589,014	2,826,916	2,972,651	2,956,150
Load factor (%)	84.0	85.9	87.0	85.4	84.8	84.8	85.9	85.2
Average ticket revenue per passenger flight segment ($)	82.30	82.00	81.71	78.00	76.65	81.06	71.85	71.30
Average non-ticket revenue per passenger flight segment ($)	42.62	43.39	44.66	48.22	51.68	51.47	49.80	52.73
Operating revenue per ASM (RASM) (cents)	10.58	11.37	11.92	11.89	11.65	12.25	11.52	11.10
CASM (cents)	9.35	9.93	10.08	10.24	10.21	10.30	9.84	10.02
Adjusted CASM (cents) (1)(2)	9.38	9.70	10.01	10.25	10.18	10.26	10.15	10.03
Adjusted CASM ex fuel (cents) (1)	5.67	5.41	5.74	6.08	5.99	6.05	6.02	5.93
Fuel gallons consumed (thousands)	28,172	31,264	31,640	29,954	32,730	35,829	37,761	36,670
Average economic fuel cost per gallon ($)	2.89	3.32	3.27	3.21	3.31	3.32	3.26	3.31

(1) Excludes special charges (credits) of $0.08 million (less than 0.01 cents per ASM) in the three months ended March 31, 2011, $2.3 million (0.09 cents per ASM) in the three months ended June 30, 2011, $0.02 million (less than 0.01 cents per ASM) in the three months ended September 30, 2011, $0.8 million (0.03 cents per ASM) in the three months ended December 31, 2011, $(0.1) million (less than (0.01) cents per ASM) in the three months ended March 31, 2012, $0.0 million (less than 0.01 cents per ASM) in the three months ended June 30, 2012, $(8.3) million ((0.28) cents per ASM) in the three months ended September 30, 2012 and $(0.1) million (less than (0.01) cents per ASM) in the three months ended December 31, 2012. These amounts are excluded from all calculations of Adjusted CASM provided in this annual report. Please see “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Our Operating Expenses—Special Charges (Credits).”

(2) Excludes unrealized mark-to-market (gains) and losses of $(0.6) million ((0.02) cents per ASM) in the three months ended March 31, 2011, $3.5 million (0.14 cents per ASM) in the three months ended June 30, 2011, $1.5 million (0.06 cents per ASM) in the three months ended September 30, 2011, $1.2 million (0.05 cents per ASM) in the three months ended December 31, 2011, $0.3 million (0.01 cents per ASM) in the three months ended March 31, 2012, $1.1 million (0.04 cents per ASM) in the three months ended June 30, 2012, $(0.9) million ((0.03) cents per ASM) in the three months ended September 30, 2012 and $(0.4) million ((0.01) cents per ASM) in the three months ended December 31, 2012. Please see “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Our Operating Expenses—Critical Accounting Policies and Estimates.”

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LIQUIDITY AND CAPITAL RESOURCES

Our primary source of liquidity is cash on hand and cash provided by operations. Our primary uses of liquidity are for working capital needs, capital expenditures, aircraft pre-delivery deposits (“PDPs”), and maintenance reserves. Our total cash at December 31, 2012 was $416.8 million, an increase of $73.5 million from December 31, 2011.

During 2011, we completed our IPO, which raised net proceeds of $150.0 million after repayment of debt, payment of transaction expenses and payments of fees to certain unaffiliated holders of our notes. Additionally, during 2011, the IPO allowed us to amend our agreements with our credit card processors enabling us to eliminate our restricted cash balance, which was 72.7 million at year-end 2010, and increase our unrestricted cash balance.

In prior periods, restricted cash represented cash collateral related primarily to a portion of our obligation to fulfill future flights, or air traffic liability (“ATL”), held by credit card processors. Our credit card processors have historically required holdbacks (collateral), which we record as restricted cash, when future air travel and other future services are purchased via credit card transactions. At September 30, 2011, our restricted cash balance was eliminated, reflecting a complete release of all holdback requirements by all of our credit card processors provided that we continue to satisfy certain financial criteria. Failure to meet these liquidity covenants would provide the processors the right to reinstate a holdback, resulting in a commensurate reduction of unrestricted cash that could be material. As of December 31, 2012, we continued to be in compliance with our credit card processing agreements, and we were not subject to any credit card holdbacks. The maximum potential exposure to cash holdbacks by our credit card processors, based upon advance ticket sales and $9 Fare Club memberships as of December 31, 2012 and December 31, 2011, was $144.8 million and $115.2 million, respectively.

Our short-term capital needs are funded primarily by cash from operations. Our most significant capital needs are to fund the acquisition costs of our aircraft. PDPs relating to future deliveries under our agreement with Airbus are required at various times prior to each delivery date. During 2012, $40.5 million of PDPs have been returned related to delivered aircraft in the period, and we have paid $53.1 million in PDPs for future deliveries of aircraft and spare engines. As of December 31, 2012, we have $96.7 million of PDPs on our balance sheet, representing the amount paid since inception, net of refunds.

Maintenance reserves are paid to aircraft lessors and are held as collateral in advance of our performance of major maintenance activities. In 2012, we paid $31.6 million in maintenance reserves, net of reimbursements, and as of December 31, 2012, we have $198.5 million ($76.1 million in other current assets and $122.4 million in aircraft maintenance deposits) on our balance sheet, representing the amount paid in reserves since inception, net of reimbursements.

We have secured financing commitments for our next nine aircraft deliveries which are scheduled for delivery in 2013. We do not have financing commitments in place for the remaining 97 aircraft currently on firm order which are scheduled for delivery in 2014 through 2021. These future aircraft deliveries may be leased or otherwise financed based on market conditions, our prevailing level of liquidity, and capital market availability.

Net Cash Flows Provided By Operating Activities. Operating activities in 2012provided$113.6 million in cash compared to $171.2 millionprovided in 2011. The decrease is primarily due to $72.7 million received from the release of all credit card holdbacks in 2011 coupled with significantly higher heavy scheduled maintenance cost in 2012, slightly offset by higher cash received on future travel as of December 31, 2012.

Operating activities in 2011 provided $171.2 million in cash compared to $27.0 million in cash generated in 2010. The increase is primarily due to the release of all our holdbacks by our credit card processors and higher earnings during 2011 compared to 2010.

Net Cash Flows Used In Investing Activities. During 2012, investing activities used$27.3 million, compared to $67.2 millionused for the prior year period. The decrease is mainly due to the refund of $40.5 million in PDPs related to the delivery of seven aircraft from Airbus and corresponding sale and leaseback transactions, and the sale of airport slots for $9.1 million. These effects were offset by higher capital expenditures, including the purchase of two spare engines for $10.3 million during 2012.

During 2011, investing activities used $67.2 million, compared to $30.5 million used for 2010. The increase is mainly related to higher PDPs made period over period due to timing of the delivery schedule for future aircraft, coupled with slightly higher capital expenditures including a spare engine for which we entered into a sale-lease back transaction during 2011. In addition, $6.7 million in returned PDPs were received from two completed aircraft sale and leaseback transactions.

Net Cash Provided By Financing Activities. During 2012, we paid $27.2 million related to the Tax Receivable Agreement (TRA), received $12.5 million in proceeds from the sale of two spare engines as part of sale and leaseback transactions,

53

retained $2.1 million as a result of excess tax benefits related to share-based payments, and received cash as a result of exercised stock options. Additional cash used in financing activities consisted of cash used to purchase treasury stock. As of December 31, 2012, an estimated remaining cash benefit of $8.0 million is expected to be paid to our Pre-IPO Stockholders under the terms of the TRA in 2013.

Commitments and Contractual Obligations

The following table discloses aggregate information about our contractual obligations as of December 31, 2012 and the periods in which payments are due (in millions):

	2013		2014 - 2015		2016 - 2017		2018 and beyond		Total
Operating lease obligations	$	168	$	331	$	296	$	379	$	1,174
Flight equipment purchase obligations	324		877		1,118		2,339		4,658
Total future payments on contractual obligations (1)	$	492	$	1,208	$	1,414	$	2,718	$	5,832

(1)     Does not include contractual payments to the Pre-IPO Stockholders under the Tax Receivable Agreement (estimated to

be approximately $8.0 million as of December 31, 2012). Please see “—Our Income Taxes.”

Some of the Company’s master lease agreements provide that the Company pays maintenance reserves to aircraft lessors to be held as collateral in advance of the Company’s required performance of major maintenance activities. Some maintenance reserve payments are fixed contractual amounts, while others are based on actual flight hours. Fixed maintenance reserve payments for these aircraft and related flight equipment, including estimated amounts for contractual price escalations, will be approximately $10.3 million in 2013, $10.6 million in 2014, $11.0 million in 2015, $11.4 million in 2016, $11.1 million in 2017, and $40.4 million in 2018 and beyond.

Additionally, the Company is contractually obligated to pay the following minimum guaranteed payments to the provider of its reservation system as of December 31, 2012: $3.1 million in 2013, $3.7 million in 2014, $3.7 million in 2015, $3.7 million in 2016, $3.7 million in 2017 and $2.5 million in 2018 and thereafter.

Off-Balance Sheet Arrangements

We have significant obligations for aircraft as all 45 of our aircraft are operated under operating leases and therefore are not reflected on our balance sheets. These leases expire between 2016 to 2024. Aircraft rent payments were $140.8 million and $116.6 million for 2012 and 2011, respectively. Our aircraft lease payments for 40 of our aircraft are fixed-rate obligations. Five of our leases provide for variable rent payments, which fluctuate based on changes in LIBOR (London Interbank Offered Rate).

Our contractual purchase commitments consist primarily of aircraft and engine acquisitions through manufacturers and aircraft leasing companies. As of December 31, 2012, our firm orders consisted of 106 A320 family aircraft (two used A319 aircraft, 54 of the existing A320 aircraft model, and 50 A320 NEOs) with Airbus and a third party, and engine orders with International Aero Engines consisted of three spare V2500 IAE International Aero Engines AG engines. Aircraft are scheduled for delivery from 2013 through 2021, and spare engines are scheduled for delivery from 2013 through 2015. Committed expenditures for these aircraft and related flight equipment, including estimated amounts for contractual price escalations and aircraft pre-delivery deposits, will be approximately $323 million for 2013, $354 million in 2014, $523 million in 2015, $505 million in 2016, $613 million in 2017 and $2,339 million in 2018 and beyond.

As of December 31, 2012, we had lines of credit related to corporate credit cards of $18.6 million from which we had drawn $3.2 million. As of December 31, 2011, we had lines of credit related to corporate credit cards of $8.6 million from which we had drawn $2.4 million.

In addition, the Company has lines of credit with counterparties to our jet fuel derivatives in the amount of $18.0 million as of December 31, 2012. Of the $18.0 million in lines of credit, $5.0 million is provided exclusively for jet fuel derivatives, $10.0 million is provided exclusively for physical fuel delivery, and the remaining $3.0 million is provided for either purpose. As of December 31, 2012, we had drawn $11.2 million for physical fuel delivery and had not drawn on the remaining lines. As of December 31, 2011, we had lines of credit with counterparties in the amount of $8.0 million exclusively for jet fuel derivatives, and as of December 31, 2011, we had not drawn on the lines of credit. We are required to post collateral for any

54

excess above the lines of credit if the derivatives are in a net liability position and make periodic payments in order to maintain an adequate undrawn portion for physical fuel delivery.

As of December 31, 2012, we have $4.1 million in uncollateralized surety bonds and a $10.0 million unsecured standby letter of credit facility, representing an off balance-sheet commitment, of which $7.0 million had been drawn upon for issued letters of credit.

55

GLOSSARY OF AIRLINE TERMS

Set forth below is a glossary of industry terms:

“Adjusted CASM” means operating expenses, excluding special charges (credits) and mark-to-market gains or losses, divided by ASMs.

“Adjusted CASM ex fuel” means operating expenses less aircraft fuel expense and excluding special charges (credits) and mark-to-market gains or losses, divided by ASMs.

“AFA-CWA” means the Association of Flight Attendants-CWA.

“Air traffic liability” or “ATL” means the value of tickets sold in advance of travel.

“ALPA” means the Airline Pilots Association, International.

“ASIF” means an Aviation Security Infrastructure Fee assessed by the TSA on each airline.

“Available seat miles” or “ASMs” means the number of seats available for passengers multiplied by the number of miles the seats are flown, also referred to as "capacity".

“Average aircraft” means the average number of aircraft in our fleet as calculated on a daily basis.

“Average daily aircraft utilization” means block hours divided by number of days in the period divided by average aircraft.

“Average economic fuel cost per gallon” means total aircraft fuel expense, excluding mark-to-market gains and losses, divided by the total number of fuel gallons consumed.

“Average non-ticket revenue per passenger flight segment” means the total non-ticket revenue divided by passenger flight segments.

“Average ticket revenue per passenger flight segment” means total passenger revenue divided by passenger flight segments.

“Average stage length” represents the average number of miles flown per flight.

“Average yield” means average operating revenue earned per RPM, calculated as total revenue divided by RPMs.

“Block hours” means the number of hours during which the aircraft is in revenue service, measured from the time of gate departure before take-off until the time of gate arrival at the destination.

“CASM” or “unit costs” means operating expenses divided by ASMs.

“CBA” means a collective bargaining agreement.

“CBP” means United States Customs and Border Protection.

“DOT” means the United States Department of Transportation.

“EPA” means the United States Environmental Protection Agency.

“FAA” means the United States Federal Aviation Administration.

“FCC” means the United States Federal Communications Commission.

“FLL Airport” means the Fort Lauderdale-Hollywood International Airport.

“GDS” means Global Distribution System (e.g., Amadeus, Galileo, Sabre and Worldspan).

“Into-plane fuel cost per gallon” means into-plane fuel expense divided by number of fuel gallons consumed.

“Into-plane fuel expense” represents the cost of jet fuel and certain other charges such as fuel taxes and oil.

“Load factor” means the percentage of aircraft seats actually occupied on a flight (RPMs divided by ASMs).

56

“NMB” means the National Mediation Board.

“Operating revenue per ASM,” “RASM” or “unit revenue” means operating revenue divided by ASMs.

“OTA” means Online Travel Agent (e.g., Orbitz and Travelocity).

“Passenger flight segments” means the total number of passengers flown on all flight segments.

“PDP” means pre-delivery deposit payment.

“Revenue passenger mile” or “RPM” means one revenue passenger transported one mile. RPMs equals revenue passengers multiplied by miles flown, also referred to as "traffic".

“RLA” means the United States Railway Labor Act.

“TWU” means the Transport Workers Union of America.

“TSA” means the United States Transportation Security Administration.

“ULCC” means “ultra low-cost carrier.”

“VFR” means visiting friends and relatives.

"Wet-leased aircraft" means a lease where the lessor provides for aircraft, crew, maintenance and insurance, also known as an "ACMI".

57

ITEM 7A.    QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Market Risk-Sensitive Instruments and Positions

We are subject to certain market risks, including commodity prices (specifically aircraft fuel). The adverse effects of changes in these markets could pose a potential loss as discussed below. The sensitivity analysis provided below does not consider the effects that such adverse changes may have on overall economic activity, nor does it consider additional actions we may take to mitigate our exposure to such changes. Actual results may differ.

Aircraft Fuel. Our results of operations can vary materially due to changes in the price and availability of aircraft fuel. Aircraft fuel expense for the years ended December 31, 2012, 2011 and 2010 represented approximately 41.2%, 41.9%, and 34.8% of our operating expenses. Increases in aircraft fuel prices or a shortage of supply could have a material adverse effect on our operations and operating results. We source a significant portion of our fuel from refining resources located in the southeast United States, particularly facilities adjacent to the Gulf of Mexico. Gulf Coast fuel is subject to volatility and supply disruptions, particularly during hurricane season when refinery shutdowns have occurred, or when the threat of weather related disruptions has caused Gulf Coast fuel prices to spike above other regional sources. During peak hurricane season (August through October), we may enter into jet fuel swaps to protect the refining price risk between the price of crude oil and the price of refined jet fuel. In addition to other fuel derivative contracts, we have historically protected approximately 70% of our forecasted fuel requirements during peak hurricane season using jet fuel swaps. Gulf Coast Jet indexed fuel is the basis for a substantial majority of our fuel consumption. Based on our annual fuel consumption, a 10% increase in the average price per gallon of aircraft fuel would have increased into-plane aircraft fuel cost for 2012 by approximately 47.2 million. To attempt to manage fuel price risk, from time to time we use jet fuel option contracts or swap agreements and basis swaps to mitigate a portion of the crack spread between crude and jet fuel. As of December 31, 2012, we had fuel hedges using U.S. Gulf Coast jet fuel collars in place for approximately 5% of its 2013 anticipated fuel consumption.

The fair value of our fuel derivative contracts as of December 31, 2012 and 2011 was $0.3 million and $0.3 million net asset (liability), respectively. We measure our financial derivative instruments at fair value. Fair value of the instruments is determined using standard option valuation models. We measure the fair value of the derivative instruments based on either quoted market prices or values provided by the counterparty. Changes in the related commodity derivative instrument cash flows may change by more or less than this amount based upon further fluctuations in futures prices. Outstanding financial derivative instruments expose us to credit loss in the event of nonperformance by the counterparties to the agreements. However, we do not expect the counterparties to fail to meet their obligations. As of December 31, 2012, we believe the credit exposure related to these fuel forward contracts was negligible.

Interest Rates. We have market risk associated with changing interest rates due to LIBOR-based lease rates on five of our aircraft. A hypothetical 10% change in interest rates in 2012 would affect total aircraft rent expense in 2013 by less than $0.1 million.

58

ITEM 8.    FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

Financial Statements:	Page
Statements of Operations	60
Balance Sheets	61
Statements of Cash Flows	62
Statements of Shareholders’ Equity (Deficit)	63
Notes to Financial Statements	64
Report of Independent Registered Public Accounting Firm	86

59

Spirit Airlines, Inc.

Statements of Operations

(In thousands, except per share data)

	Year Ended December 31,
	2012			2011			2010
Operating revenues:
Passenger	$	782,792		$	689,650		$	537,969
Non-ticket	535,596			381,536			243,296
Total operating revenue	1,318,388			1,071,186			781,265
Operating expenses:
Aircraft fuel	471,763			388,046			248,206
Salaries, wages and benefits	218,919			181,742			156,443
Aircraft rent	143,572			116,485			101,345
Landing fees and other rents	68,368			52,794			48,118
Distribution	56,668			51,349			41,179
Maintenance, materials and repairs	49,460			34,017			27,035
Depreciation and amortization	15,256			7,760			5,620
Other operating	127,886			91,172			83,748
Loss on disposal of assets	956			255			77
Special charges (credits)	(8,450		)	3,184			621
Total operating expenses	1,144,398			926,804			712,392
Operating income	173,990			144,382			68,873
Other (income) expense:
Interest expense	1,350			24,781			50,313
Capitalized interest	(1,350		)	(2,890		)	(1,491		)
Interest income	(925		)	(575		)	(328		)
Other expense	331			235			194
Total other (income) expense	(594		)	21,551			48,688
Income before income taxes	174,584			122,831			20,185
Provision for income taxes	66,124			46,383			(52,296		)
Net income	$	108,460		$	76,448		$	72,481
Net income per share, basic	$	1.50		$	1.44		$	2.77
Net income per share, diluted	$	1.49		$	1.43		$	2.72

See accompanying Notes to Financial Statements.

60

Spirit Airlines, Inc.

Balance Sheets

(In thousands, except share data)

	December 31, 2012			December 31, 2011
Assets
Current assets:
Cash and cash equivalents	$	416,816		$	343,328
Accounts receivable, net	22,740			15,425
Deferred income taxes	12,591			20,738
Other current assets	95,210			63,217
Total current assets	547,357			442,708
Property and equipment:
Flight equipment	2,648			4,182
Ground and other equipment	43,580			46,608
Less accumulated depreciation	(17,825		)	(27,580		)
	28,403			23,210
Deposits on flight equipment purchase contracts	96,692			91,450
Aircraft maintenance deposits	122,379			120,615
Deferred heavy maintenance and other long-term assets	125,053			67,830
Total assets	$	919,884		$	745,813
Liabilities and shareholders’ equity
Current liabilities:
Accounts payable	$	24,166		$	15,928
Air traffic liability	131,414			112,280
Other current liabilities	121,314			98,856
Total current liabilities	276,894			227,064
Long-term deferred income taxes	33,216			12,108
Deferred credits and other long-term liabilities	27,239			39,935
Shareholders’ equity:
Common stock: Common stock, $.0001 par value, 240,000,000 shares authorized at December 31, 2012 and 2011, respectively; 70,861,822 and 61,954,576 issued and 70,801,782 and 61,946,361 outstanding as of December 31, 2012 and 2011, respectively	6			6
Common stock: Non-Voting common stock: $.0001 par value, 50,000,000 shares authorized at December 31, 2012 and 2011, respectively; 1,669,205 and 10,576,180 issued and outstanding as of December 31, 2012 and 2011, respectively	1			1
Additional paid-in-capital	504,527			496,136
Treasury stock, at cost: 60,040 and 8,215 as of December 31, 2012 and 2011, respectively	(1,151		)	(129		)
Retained earnings (deficit)	79,152			(29,308		)
Total shareholders’ equity	582,535			466,706
Total liabilities and shareholders’ equity	$	919,884		$	745,813

See accompanying Notes to Financial Statements.

61

Spirit Airlines, Inc.

Statements of Cash Flows

(In thousands)

	Year Ended December 31,
	2012			2011			2010
Operating activities:
Net income	$	108,460		$	76,448		$	72,481
Adjustments to reconcile net income to net cash provided by operations:
Changes in fair value of open fuel hedge contracts	46			3,204			(2,065		)
Non-cash restructuring credit charges, net	—			—			22
Equity based stock compensation, net	4,327			530			569
Allowance for doubtful accounts (recoveries)	78			27			(110		)
Amortization of deferred gains, losses and debt issuance costs	(830		)	(1,047		)	(574		)
Depreciation and amortization	15,256			7,760			5,620
Deferred income tax benefit (loss)	29,255			44,180			(52,811		)
Loss on disposal of assets	956			255			77
Gain on slot sale	(9,060		)	—			—
Interest and dividends incurred but not paid	—			21,875			43,202
Capitalized interest	(1,350		)	(2,890		)	(1,491		)
Changes in operating assets and liabilities:
Restricted cash	—			72,736			(20,196		)
Accounts receivable	(7,393		)	(5,728		)	(1,014		)
Prepaid maintenance reserves	(31,567		)	(36,848		)	(35,694		)
Long-term deposits and other assets	(68,248		)	(15,992		)	(13,981		)
Accounts payable	8,452			2,457			(2,007		)
Air traffic liability	19,134			6,573			19,107
Other liabilities	46,115			(2,189		)	16,132
Other	—			(153		)	(234		)
Net cash provided by operating activities	113,631			171,198			27,033
Investing activities:
Proceeds from sale of property and equipment	14			150			333
Proceeds from sale of slots	9,060			—			—
Pre-delivery deposits for flight equipment, net of refunds	(12,626		)	(53,274		)	(25,474		)
Purchase of property and equipment	(23,771		)	(14,093		)	(5,325		)
Net cash used in investing activities	(27,323		)	(67,217		)	(30,466		)
Financing activities:
Proceeds from issuance of common stock, net offering expenses	—			170,828			—
Proceeds from options exercised	469			423			—
Payments on debt and capital lease obligations	—			(18,221		)	—
Proceeds from sale leaseback transactions	12,540			4,481			—
Payments to pre-IPO shareholders pursuant to tax receivable agreement	(26,905		)	—			—
Excess tax benefits from share-based compensation	2,098			—			—
Repurchase of common stock	(1,022		)	(886		)	—
Debt issuance costs	—			8			—
Net cash (used in) provided by financing activities	(12,820		)	156,633			—
Net increase (decrease) in cash and cash equivalents	73,488			260,614			(3,433		)
Cash and cash equivalents at beginning of period	343,328			82,714			86,147
Cash and cash equivalents at end of period	$	416,816		$	343,328		$	82,714
Supplemental disclosures
Cash payments for:
Interest	$	303		$	10,562		$	4,303
Taxes	$	40,204		$	1,477		$	562
Non-cash transactions:
Exchange of notes due to related parties for common stock	$	—		$	279,206		$	—
Exchange of mandatorily redeemable preferred stock for common stock	$	—		$	81,747		$	—
Liability and equity related to tax receivable agreement	$	(1,497	)	$	36,488		$	—

See accompanying Notes to Financial Statements.

62

Spirit Airlines, Inc.

Statements of Shareholders’ Equity (Deficit)

(In thousands)

	Class A Common Stock			Class B Common Stock			Common Stock			Non- Voting Common Stock		Additional Paid-In Capital			Treasury Stock			Retained Earnings (Accumulated Deficit)			Total
Balance at December 31, 2009	$	2		$	1		$	—		$	—	$	107		$	—		$	(178,237	)	$	(178,127	)
Share-based compensation	—			—			—			—		569			—			—			569
Net income	—			—			—			—		—			—			72,481			72,481
Balance at December 31, 2010	2			1			—			—		676			—			(105,756		)	(105,077		)
Conversion of Class A & B common stock to common stock	(2		)	(1		)	3			—		—			—			—			—
Proceeds from initial public offering, net	—			—			1			—		170,827			—			—			170,828
Conversion of debt to common stock	—			—			2			—		279,204			—			—			279,206
Conversion of preferred stock to common stock	—			—			1			—		81,746			—			—			81,747
Record liability under Tax Receivable Agreement	—			—			—			—		(36,522		)	—			—			(36,522		)
Share-based compensation	—			—			—			—		530			—			—			530
Repurchase of common stock	—			—			—			—		(757		)	(129		)	—			(886		)
Conversion of common stock to non-voting common stock	—			—			(1		)	1		—			—			—			—
Proceeds from options exercised	—			—			—			—		423			—			—			423
Net income	—			—			—			—		—			—			76,448			76,448
Other	—			—			—			—		9			—			—			9
Balance at December 31, 2011	—			—			6			1		496,136			(129		)	(29,308		)	466,706
Adjustment to liability recorded under Tax Receivable Agreement	—			—			—			—		1,497			—			—			1,497
Share-based compensation	—			—			—			—		4,327			—			—			4,327
Repurchase of common stock												—			(1,022		)	—			(1,022		)
Proceeds from options exercised												469			—			—			469
Tax benefit of options exercised												2,098			—			—			2,098
Net income	—			—			—			—		—			—			108,460			108,460
Balance at December 31, 2012	$	—		$	—		$	6		$	1	$	504,527		$	(1,151	)	$	79,152		$	582,535

See accompanying Notes to Financial Statements.

63

Notes to Financial Statements

1. Summary of Significant Accounting Policies

Basis of Presentation

Spirit Airlines, Inc. (Spirit or the Company) headquartered in Miramar, Florida, is an ultra low-cost, low-fare airline that provides affordable travel opportunities principally throughout the domestic United States, the Caribbean and Latin America. The Company manages operations on a system-wide basis due to the interdependence of its route structure in the various markets served. As only one service is offered (i.e., air transportation), management has concluded that there is only one reportable segment.

Certain prior period amounts have been reclassified to conform to the current year's presentation.

Use of Estimates

The preparation of financial statements in conformity with generally accepted accounting principles in the United States of America requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from these estimates.

Cash and Cash Equivalents

The Company considers all highly liquid investments with maturities of less than three months at the date of acquisition to be cash equivalents. Investments included in this category primarily consist of money market funds.

Restricted Cash

Restricted cash primarily consists of funds held by credit card processors as collateral for future travel paid with a credit card.

Accounts Receivable

Accounts receivable primarily consist of amounts due from credit card processors associated with the sales of tickets and amounts due from counterparties associated with fuel derivative instruments that have settled. The allowance for doubtful accounts was immaterial as of December 31, 2012, 2011 and 2010.

In addition, the provision for doubtful accounts and write-offs for 2012, 2011 and 2010 were each immaterial.

Deferred Offering Costs

The Company complies with the requirements of SEC Staff Accounting Bulletin (SAB) Topic 5A—“Expenses of Offering.” Deferred offering costs consisted principally of legal, accounting, printing, and underwriting fees related to the Company's initial public offering (the IPO). A total of $6.1 million in deferred offering costs were charged to additional paid-in capital net of proceeds in connection with the consummation of the IPO in 2011.

Property and Equipment

Property and equipment are stated at cost, less accumulated depreciation and amortization. Depreciation of operating property and equipment is computed using the straight-line method applied to each unit of property, except on flight equipment (major rotable parts, avionics, and assemblies), which are depreciated on a group basis over the average life of the applicable equipment. During 2012, the Company wrote off approximately $15.3 million in fully depreciated and out-of-service assets and recorded a corresponding entry to accumulated depreciation.

The depreciable lives used for the principal depreciable asset classifications are:

	Estimated Useful Life
Spare rotables and flight assemblies	Lesser of the useful life of equipment or average remaining fleet life
Other equipment and vehicles	5 to 7 years
Internal use software	3 to 10 years

64

Notes to Financial Statements—(Continued)

All aircraft and spare engines are financed through operating leases with terms of 3 to 12 years for aircraft and 7 to 12 years for spare engines. Residual values for major spare rotable parts, avionics, and assemblies are estimated to be 10%.

The following table illustrates the components of depreciation and amortization expense:

	Year Ended December 31,
	2012		2011		2010
	(in thousands)
Depreciation	$	6,156	$	5,186	$	4,313
Amortization of heavy maintenance	9,100		2,574		1,307
Total depreciation and amortization	$	15,256	$	7,760	$	5,620

The Company capitalizes certain internal and external costs associated with the acquisition and development of internal use software for new products, and enhancements to existing products that have reached the application development stage and meet recoverability tests. Capitalized costs include external direct costs of materials and services utilized in developing or obtaining internal-use software, and labor cost for employees who are directly associated with and devote time to internal-use software projects. These costs are included in property and equipment.

Amortization of capitalized software development costs is charged to depreciation on a straight-line method basis. Amortization of capitalized software development costs was $3.2 million, $2.0 million, and $1.1 million for the years ended 2012, 2011, and 2010, respectively. The Company capitalized $2.3 million, $3.3 million, and $2.4 million, of software development costs during the years ended 2012, 2011, and 2010, respectively.

Measurement of Asset Impairments

The Company records impairment charges on long-lived assets used in operations when events and circumstances indicate that the assets may be impaired, the undiscounted cash flows estimated to be generated by those assets are less than the carrying amount of those assets, and the net book value of the assets exceeds their estimated fair value. In making these determinations, the Company uses certain assumptions, including, but not limited to: (i) estimated fair value of the assets; and (ii) estimated, undiscounted future cash flows expected to be generated by these assets, which are based on additional assumptions such as asset utilization, length of service the asset will be used in the Company’s operations, and estimated salvage values.

Capitalized Interest

Interest attributable to funds used to finance the acquisition of new aircraft is capitalized as an additional cost of the related asset. Capitalization of interest ceases when the asset is no longer being prepared for its intended use or is ready for service.

Passenger Revenue Recognition

Tickets sold are initially deferred as “air traffic liability.” Passenger revenue is recognized at time of departure when transportation is provided. A nonrefundable ticket expires at the date of scheduled travel and is recognized as revenue at the date of scheduled travel.

Customers may elect to change their itinerary prior to the date of departure. A service charge is assessed and recognized on the date the change is initiated and is deducted from the face value of the original purchase price of the ticket, and the original ticket becomes invalid. The amount remaining after deducting the service charge is called a credit shell which expires 60 days from the date the credit shell is created and can be used towards the purchase of a new ticket and the Company’s other service offerings. The amount of credits expected to expire is recognized as revenue upon issuance of the credit and is estimated based on historical experience. Estimating the amount of credits that will go unused involves some level of subjectivity and judgment.

The Company is also required to collect certain taxes and fees from customers on behalf of government agencies and airports and remit these back to the applicable governmental entity or airport on a periodic basis. These taxes and fees include U.S. federal transportation taxes, federal security charges, airport passenger facility charges, and foreign arrival and departure taxes. These items are collected from customers at the time they purchase their tickets, but are not included in passenger revenue. The Company records a liability upon collection from the customer and relieves the liability when payments are remitted to the applicable governmental agency or airport.

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Notes to Financial Statements—(Continued)

Frequent Flier Program

Flown Miles. The Company records a liability for mileage credits earned by passengers, including mileage credits for members with an insufficient number of mileage credits to earn an award, under its FREE SPIRIT program based on the estimated incremental cost of providing free travel for credits that are expected to be redeemed. Incremental costs include fuel, insurance, security, ticketing, and facility charges reduced by an estimate of fees required to be paid by the passenger when redeeming the award.

Original Affinity Card Program. The Company also sells mileage credits to companies participating in the FREE SPIRIT program (or affinity card program). Under the original affinity card program, funds received from the sale of mileage credits were accounted for as a multiple element arrangement and allocated to a marketing component and a transportation component (mileage credits) using the residual method. The fair value of the transportation component was deferred and recognized ratably as passenger revenue over the estimated period the transportation was expected to be provided which was estimated at 16 months. The difference between the funds received and the fair value of the transportation component was recognized in non-ticket revenue at the time of sale as non-ticket marketing revenue. The marketing component represented the Company’s compensation for use of its trademark, customer lists and placement of marketing materials to encourage application for credit cards. Because there were no undelivered elements other than the mileage credits, the Company recorded the revenue from the marketing component when funds were received. The Company also received bonuses from companies participating in the FREE SPIRIT program that are driven by the volume of the usage of the Company’s co-branded credit cards. The Company recognized these bonuses as non-ticket revenue when payment was received (milestone method) as the milestones are substantive.

During the fourth quarter of 2010, the Company determined not to renew its agreement with the administrator of the FREE SPIRIT affinity credit card program at the scheduled expiration in February 2011. In connection with that non-renewal, the Company entered into an agreement with the former administrator regarding the transition of the program to a new provider and the remittance to the Company of compensation due to the Company for card members obtained through the Company’s marketing services in the amount of $5.0 million, of which $4.6 million was recognized in the fourth quarter of 2010 and $0.4 million was recognized in the first quarter of 2011.

New Affinity Card Program. The Company entered into a new affinity card program that became effective April 1, 2011. The agreement calls for the marketing of a co-branded Spirit credit card and the delivery of award miles over the five-year contract term. At the inception of the arrangement, the Company evaluated all deliverables in the arrangement to determine whether they represent separate units of accounting using the criteria as set forth in ASU No. 2009-13. The Company determined the arrangement had three separate units of accounting: (i) travel miles to be awarded, (ii) licensing of brand and access to member lists, and (iii) advertising and marketing efforts. Under ASU No. 2009-13, arrangement consideration should be allocated based on relative selling price. At inception of the arrangement, the Company established the relative selling price for all deliverables that qualified for separation. The manner in which the selling price was established was based on a hierarchy of evidence that the Company considered. Total arrangement consideration was then allocated to each deliverable on the basis of the deliverable’s relative selling price. In considering the hierarchy of evidence under ASU No. 2009-13, the Company first determined whether vendor specific objective evidence of selling price or third-party evidence of selling price existed. It was determined by the Company that neither vendor specific objective evidence of selling price nor third-party evidence existed due to the uniqueness of the Company’s program. As such, the Company developed its best estimate of the selling price for all deliverables. For the award miles, the Company considered a number of entity-specific factors when developing the best estimate of the selling price including the number of miles needed to redeem an award, average fare of comparable segments, breakage, restrictions, and other charges. For licensing of brand and access to member lists, the Company considered both market-specific factors and entity-specific factors including general profit margins realized in the marketplace/industry, brand power, market royalty rates, and size of customer base. For the advertising element, the Company considered market-specific factors and entity-specific factors including, the Company’s internal costs (and fluctuations of costs) of providing services, volume of marketing efforts, and overall advertising plan. Consideration allocated based on the relative selling price to both brand licensing and advertising elements is recognized as revenue when earned and recorded in non-ticket revenue. Consideration allocated to award miles is deferred and recognized ratably as passenger revenue over the estimated period the transportation is expected to be provided which is estimated at 16 months. The Company used entity-specific assumptions coupled with the various judgments necessary to determine the selling price of a deliverable in accordance with the required selling price hierarchy. Changes in these assumptions (e.g., cost of fare, number of miles to redeem awards, marketing plan, and approval rate of credit cards) could result in changes in the estimated selling prices. Determining the frequency to reassess selling price for individual deliverables requires significant judgment. Mileage credits that expire under the terms of the Company's policy or are not likely to be redeemed are collectively referred to as breakage. The Company estimates and recognizes breakage on its frequent flier miles in proportion to actual mileage redemptions, in accordance with the redemption recognition method.

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Notes to Financial Statements—(Continued)

The following table illustrates total cash proceeds received from the sale of mileage credits and the portion of such proceeds recognized in revenue immediately as marketing component:

	Cash proceeds from sale of miles to non-airline third parties		Portion of proceeds recognized immediately as marketing component
Year Ended	(in thousands)
December 31, 2012	$	24,938	$	20,998
December 31, 2011	20,954		16,580
December 31, 2010	20,748		10,576

The total liability for future FREE SPIRIT award redemptions and unrecognized revenue from the sale of mileage credits was $2.4 million and $3.7 million at December 31, 2012 and 2011, respectively. These balances are recorded as a component of air traffic liability in the accompanying balance sheets.

Non-ticket Revenue Recognition

Non-ticket revenues are generated from air travel-related services for baggage, bookings through the Company’s call center or third-party vendors, advance seat selection, itinerary changes and loyalty programs. Non-ticket revenues also consist of services not directly related to providing transportation such as the FREE SPIRIT affinity credit card program, $9 Fare Club, and the sale of advertising to third parties on Spirit’s website and on board aircraft.

The following table summarizes the primary components of non-ticket revenue and the revenue recognition method utilized for each service or product:

		Year Ended December 31,
Non-ticket revenue	Recognition method	2012		2011		2010
		(in thousands)
Baggage	Time of departure	$	217,536	$	168,290	$	91,393
Passenger usage fee	Time of departure	149,577		71,757		47,367
Advance seat selection	Time of departure	48,956		42,112		32,512
Service charges for changes and cancellations	When itinerary is changed	27,762		25,927		23,120
Other		91,765		73,450		48,904
Non-ticket revenue		$	535,596	$	381,536	$	243,296

Charges for services recognized at time of departure are initially recorded as a liability until time of departure. The passenger usage fee is charged for tickets sold through the Company’s primary sales distribution channels, to cover the Company’s distribution costs. The primary sales distribution channels for which passenger usage fees are charged include sales through the Company’s website, sales through the third-party provided call center, and sales through travel agents; the Company does not charge a passenger usage fee for sales made at its airport ticket counters. Other non-ticket revenues include revenues from other air related charges as well as non-air related charges. Other air related charges include optional services and products provided to passengers such as on-board products, travel insurance, and use of the Company’s call center or travel agents, among others. Non-air related charges primarily consist of revenues from advertising on the Company’s aircraft and website, the Company’s $9 Fare Club subscription-based membership program, and the Company’s FREE SPIRIT affinity credit card program.

Airframe and Engine Maintenance

The Company accounts for heavy maintenance and major overhaul and repair under the deferral method whereby the cost of heavy maintenance and major overhaul and repair is deferred and amortized based on usage through the next overhaul event.

Amortization of heavy maintenance and major overhaul costs is charged to depreciation and amortization expense and was $9.1 million , $2.6 million, and $1.3 million for the years ended 2012, 2011, and 2010, respectively. During the years ended 2012, 2011, and 2010, the Company deferred $61.6 million, $22.1 million, and $5.2 million, respectively, of costs for heavy maintenance. Accumulated heavy maintenance amortization was $14.0 million, $4.9 million, and $2.3 million for the years ended 2012 and 2011, and 2010

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Notes to Financial Statements—(Continued)

The Company outsources certain routine, non-heavy maintenance functions under contracts that require payment on a utilization basis, such as flight hours. Costs incurred for maintenance and repair under flight hour maintenance contracts, where labor and materials price risks have been transferred to the service provider, are expensed based on contractual payment terms. All other costs for routine maintenance of the airframes and engines are charged to expense as performed.

The table below summarizes the extent to which the Company’s maintenance costs are rate capped due to flight hour maintenance contracts:

	Year Ended December 31,
	2012		2011		2010
	(in thousands)
Flight hour-based maintenance expense	$	25,748	$	21,974	$	16,683
Non-flight hour-based maintenance expense	23,712		12,043		10,352
Total maintenance expense	$	49,460	$	34,017	$	27,035

Leased Aircraft Return Costs

Costs associated with returning leased aircraft are accrued when it is probable that a cash payment will be made and that amount is reasonably estimable. Any accrual is based on time remaining on the lease, planned aircraft usages, and the provisions included in the lease agreement, although the actual amount due to any lessor upon return will not be known with certainty until lease termination.

Aircraft Fuel

Aircraft fuel expense includes jet fuel and associated “into-plane” costs, taxes, oil, and all gains and losses associated with fuel hedge contracts.

Derivative Instruments

The Company accounts for derivative financial instruments at fair value and recognizes them in the balance sheet in other current assets or other current liabilities. For derivatives designated as cash flow hedges, changes in fair value of the derivative are generally reported in other comprehensive income and are subsequently reclassified into earnings when the hedged item affects earnings. For the years ended 2012, 2011 and 2010, the Company did not hold derivative instruments that qualified as cash flow hedges for accounting purposes. As a result, changes in the fair value of such derivative contracts were recorded within aircraft fuel expense in the accompanying statements of operations. These amounts include both realized gains and losses and mark-to-market adjustments of the fair value of unsettled derivative instruments at the end of each period.

Advertising

The Company expenses advertising and the production costs of advertising as incurred. Marketing and advertising expenses were $2.4 million, $2.5 million, and $4.0 million for the years ended 2012, 2011 and 2010, respectively.

Income Taxes

The Company accounts for income taxes using the liability method. The Company records a valuation allowance to reduce the deferred tax assets reported if, based on the weight of the evidence, it is more likely than not that some portion or all of the deferred tax assets will be not realized.

Interest Expense

Related-party interest expense incurred during 2012, 2011 and 2010 was $0.0 million, $21.0 million, and $44.6 million, respectively, and consisted primarily of paid-in-kind interest on tranche notes due to related parties and preferred stock dividends due to related parties. Non-related party interest expense during 2012, 2011 and 2010 was $1.4 million, $3.8 million and $5.7 million, respectively.

Stock-Based Compensation

The Company recognizes cost of employee services received in exchange for awards of equity instruments based on the fair value of each instrument at the date of grant. Compensation expense is recognized on a straight-line basis over the period during which an employee is required to provide service in exchange for an award. The Company has issued and outstanding

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Notes to Financial Statements—(Continued)

restricted stock awards, stock option awards, and performance share awards. Restricted stock awards are valued at the fair value of the shares on the date of grant if vesting is based on a service or a performance condition. To the extent a market price was not available, the fair value of stock awards was estimated using a discounted cash flow analysis based on management’s estimates of revenue, driven by assumed market growth rates, and estimated costs as well as appropriate discount rates. These estimates are consistent with the plans and estimates that management uses to manage the Company’s business. The fair value of share option awards is estimated on the date of grant using the Black-Scholes valuation model. The fair value of performance share awards is estimated through the use of a Monte Carlo simulation model. See Note 8 for additional information.

Concentrations of Risk

The Company’s business has been, and may continue to be, adversely affected by increases in the price of aircraft fuel, the volatility of the price of aircraft fuel, or both. Aircraft fuel was the Company’s single largest expenditure representing approximately 41%, 42%, and 35% of total operating expenses in 2012, 2011, and 2010, respectively.

The Company’s operations are largely concentrated in the southeast United States with Fort Lauderdale being the highest volume fueling point in the system. Gulf Coast Jet indexed fuel is the basis for a substantial majority of the Company’s fuel consumption. Any disruption to the oil production or refinery capacity in the Gulf Coast, as a result of weather or any other disaster or disruptions in supply of jet fuel, dramatic escalations in the costs of jet fuel, and/or the failure of fuel providers to perform under fuel arrangements for other reasons could have a material adverse effect on the Company’s financial condition and results of operations.

The Company’s operations will continue to be vulnerable to weather conditions (including hurricane season or snow and severe winter weather), which could disrupt service, create air traffic control problems, decrease revenue, and increase costs.

Due to the relatively small size of the fleet and high utilization rate, the unavailability of one or more aircraft and resulting reduced capacity could have a material adverse effect on the Company’s business, results of operations, and financial condition.

The Company has three union-represented employee groups that together represent approximately 54% and 52% of all employees at December 31, 2012 and 2011, respectively. A strike or other significant labor dispute with the Company’s unionized employees is likely to adversely affect the Company’s ability to conduct business. Additional disclosures are included in Note 15.

2. Recent Accounting Developments

In May 2011, the FASB issued Accounting Standards Update No. 2011-04, Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and International Financial Reporting Standards (Topic 820)—Fair Value Measurement (ASU 2011-04). This ASU provides a consistent definition of fair value and ensures the fair value measurement and disclosure requirements are similar between GAAP and International Financial Reporting Standards. ASU 2011-04 changes certain fair value measurement principles and enhances the disclosure requirements particularly for Level 3 fair value measurements. ASU 2011-04 requires public and non-public companies to disclose the unobservable inputs that are significant to the fair value measurement. Public companies are now required to quantitatively disclose the unobservable inputs used in their Level 3 measurements. ASU 2011-04 provides examples of information companies might provide to comply with the disclosure requirements. The requirements include: (1) a description of the group responsible for valuation policies and procedures, to whom the group reports and the types of internal reporting procedures in place (e.g., interaction between the group and risk management or the audit committee to assess fair value measurements); (2) a description of the frequency and methods for calibration, back testing and other testing procedures used to evaluate pricing models; (3) a description of the process for analyzing changes in fair value measurements from period to period; (4) a description of the methods used to evaluate pricing information provided by third-party brokers or pricing services; (5) a description of the methods used to develop and substantiate the unobservable inputs used in a fair value measurement; and (6) a narrative description of the sensitivity of recurring Level 3 fair value measurements to changes in the unobservable inputs used, if changing those inputs would significantly affect the fair value measurement. On January 1, 2012, the Company adopted ASU 2011-04.

The adoption of ASU 2011-04 resulted in qualitative presentation changes to the Company's disclosures related to fair value measurements as disclosed in Note 8. These changes were primarily additional language regarding the Company's valuation policies and procedures including the frequency of valuation and testing of valuation models as well as the sensitivity of the Company's model to changes in unobservable inputs.

In December 2011, the FASB issued amendments to Accounting Standards Update No. 2011-11, Balance Sheet (Topic 210); Disclosures about Offsetting Assets and Liabilities (ASU 2011-11). The amendments in this update are designed to enhance disclosures by requiring improved information about financial instruments and derivative instruments that are either

69

Notes to Financial Statements—(Continued)

(a) offset in accordance with certain right to set-off conditions prescribed by current accounting guidance or (b) subject to an enforceable master netting arrangement or similar agreement, irrespective of whether they are offset in accordance with current accounting guidance. The amendments to ASU 2011-11 will be effective for the first interim or annual period beginning on or after January 1, 2013. Management does not expect the adoption of ASU 2011-11 to have a material impact on its financial statements.

3. Special Charges and Credits

Slot Transaction

In June 2012, the Company transferred four permanent air carrier slots at Ronald Reagan National Airport (“DCA”) to another airline ("buyer") for $9.1 million in cash, which the Company received in June. Due to FAA regulations, the buyer could not operate the slots until written confirmation of the slot transfer had been received from the FAA. In accordance with FAA's 80% “use or lose” requirements, the Company continued to operate all four slots through September 6, 2012. Due to the restriction preventing operating use of the slots by buyer, the gain of $9.1 million was fully deferred at the time of the sale. The Company recognized the $9.1 million gain within special charges (credits) in the third quarter of 2012, the period in which the FAA operating restriction lapsed and written confirmation of the slot transfer was received by the buyer from the FAA. 

Secondary Offering Costs

On July 31, 2012, certain existing stockholders affiliated with Oaktree Capital Management ("Oaktree") sold an aggregate of 9,394,927 shares of common stock in an underwritten public offering. The Company incurred a total of $0.7 million in costs during the year ended December 31, 2012, related to this offering. Upon completion of this offering, investment funds affiliated with Oaktree owned no shares of common stock of Spirit Airlines. The Company did not receive any proceeds from this offering.

Previously, on January 25, 2012, certain stockholders of the Company, including affiliates of Oaktree and Indigo Partners, LLC ("Indigo") and certain members of the Company's executive team, sold an aggregate of 12,650,000 shares of common stock in an underwritten public offering. The Company incurred a total of $1.3 million in costs between 2011 and 2012 related to this offering, of which $0.5 million were incurred during the year ended December 31, 2012, offset by reimbursements from certain selling shareholders of $0.6 million in accordance with the Fourth Amendment to the Second Amended and Restated Investor Rights Agreement. The Company did not receive any proceeds from this offering.

Initial Public Offering Costs

In June 2011, the Company issued and sold 15,600,000 shares of common stock in its initial public offering (IPO). The Company incurred contract termination costs and fees of $2.25 million in connection with the IPO during the year ended December 31, 2011, which included $1.8 million paid to Indigo to terminate its professional services agreement with the Company and $0.5 million paid to three individual, unaffiliated holders of the Company’s subordinated notes.

4. Letters of Credit

In connection with agreements with certain airports, the Company is required to post letters of credit, which totaled $0.2 million as of both December 31, 2012 and 2011. The issuing banks require that the Company deposit funds at those banks to cover the amounts that could be drawn under the letters of credit. These funds are generally invested in money market accounts and are classified as long-term assets within deferred heavy maintenance and other long-term assets. Additionally, as of December 31, 2012, the Company had a $10.0 million unsecured standby letter of credit facility, representing an off balance-sheet commitment, of which $7.0 million had been drawn upon for issued letters of credit.

5. Credit Card Processing Arrangements

The Company has agreements with organizations that process credit card transactions arising from the purchase of air travel, baggage charges, and other ancillary services by customers. As it is standard in the airline industry, the Company's contractual arrangements with credit card processors permit them, under certain circumstances, to retain a holdback or other collateral, which the Company records as restricted cash, when future air travel and other future services are purchased via credit card transactions. The required holdback is the percentage of the Company's overall credit card sales that its credit card processors hold to cover refunds to customers if the Company fails to fulfill its flight obligations.

During 2011, the Company amended its processing agreements with all of its processors. Prior to the amendments, the credit card processors required the Company to maintain cash collateral equal to approximately 100% of the Company's air traffic liability. The amendments were approved in light of the Company's improved balance sheet as a result of the IPO, the related recapitalization and the elimination of the holdback held by the credit card processors, effectively eliminating the

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Notes to Financial Statements—(Continued)

Company's restricted cash balance, provided that the Company continues to satisfy certain liquidity and other financial covenants. Failure to meet these covenants would provide the processors the right to reinstate a holdback, resulting in a commensurate reduction of unrestricted cash. As of December 31, 2012 and 2011, the Company continued to be in compliance with its credit card processing agreements, and the processors were holding back $0 of remittances.

The maximum potential exposure to cash holdbacks by the Company's credit card processors, based upon advance ticket sales and $9 Fare Club memberships as of December 31, 2012 and 2011, was $144.8 million and $115.2 million, respectively.

6. Accrued Liabilities

Accrued liabilities included in other current liabilities as of December 31, 2012 and 2011 consist of the following:

	As of December 31,
	2012		2011
	(in thousands)
Federal excise and other passenger taxes and fees payable	$	23,401	$	17,813
Aircraft maintenance	22,319		7,816
Salaries and wages	21,057		17,123
Airport expenses	16,024		10,682
Fuel	11,219		87
Aircraft and facility rent	8,020		7,206
Current portion of tax receivable agreement	7,987		27,399
Other	11,287		10,730
Accrued liabilities	$	121,314	$	98,856

7. Common Stock and Preferred Stock

The Company’s amended and restated certificate of incorporation dated June 1, 2011, authorizes the Company to issue up to 240,000,000 shares of common stock, $0.0001 par value per share, 50,000,000 shares of non-voting common stock, $0.0001 par value per share, and 10,000,000 shares of preferred stock, $0.0001 par value per share. All of the Company’s issued and outstanding shares of common stock and preferred stock are duly authorized, validly issued, fully paid and non-assessable. The Company’s shares of common stock and non-voting common stock are not redeemable and do not have preemptive rights.

Common Stock

Dividend Rights. Holders of the Company’s common stock are entitled to receive dividends, if any, as may be declared from time to time by the Company’s board of directors out of legally available funds ratably with shares of the Company’s non-voting common stock, subject to preferences that may be applicable to any then outstanding preferred stock and limitations under Delaware law.

Voting Rights. Each holder of the Company’s common stock is entitled to one vote for each share on all matters submitted to a vote of the stockholders, including the election of directors. The Company’s stockholders do not have cumulative voting rights in the election of directors. Accordingly, holders of a majority of the voting shares are able to elect all of the directors properly up for election at any given stockholders’ meeting.

Liquidation. In the event of the Company’s liquidation, dissolution or winding up, holders of the Company's common stock will be entitled to share ratably with shares of the Company’s non-voting common stock in the net assets legally available for distribution to stockholders after the payment of all of the Company’s debts and other liabilities and the satisfaction of any liquidation preference granted to the holders of any then outstanding shares of preferred stock.

Rights and Preferences. Holders of the Company’s common stock have no preemptive, conversion, subscription or other rights, and there are no redemption or sinking fund provisions applicable to the Company’s common stock. The rights, preferences and privileges of the holders of the Company’s common stock are subject to and may be adversely affected by, the rights of the holders of shares of any series of the Company’s preferred stock that the Company may designate in the future.

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Notes to Financial Statements—(Continued)

Non-Voting Common Stock

Dividend Rights. Holders of the Company’s non-voting common stock are entitled to receive dividends, if any, as may be declared from time to time by the Company’s board of directors out of legally available funds ratably with shares of the Company’s common stock, subject to preferences that may be applicable to any then outstanding preferred stock and limitations under Delaware law.

Voting Rights. Shares of the Company’s non-voting common stock are not entitled to vote on any matters submitted to a vote of the stockholders, including the election of directors, except to the extent required under Delaware law.

Conversion Rights. Shares of the Company’s non-voting common stock will be convertible on a share-for-share basis into common stock at the election of the holder subject to the Company remaining in compliance with applicable foreign ownership limitations.

Liquidation. In the event of the Company’s liquidation, dissolution or winding up, holders of the Company’s non-voting common stock will be entitled to share ratably with shares of the Company’s common stock in the net assets legally available for distribution to stockholders after the payment of all of the Company’s debts and other liabilities and the satisfaction of any liquidation preference granted to the holders of any then outstanding shares of preferred stock.

Rights and Preferences. Holders of the Company’s non-voting common stock have no preemptive, subscription or other rights, and there are no redemption or sinking fund provisions applicable to the Company’s common stock. The rights, preferences and privileges of the holders of the Company’s common stock are subject to and may be adversely affected by, the rights of the holders of shares of any series of the Company’s preferred stock that the Company may designate in the future.

On December 7, 2011, the Company entered into a Stock Distribution Agreement with Indigo Miramar LLC and its members. Pursuant to the Stock Distribution Agreement 10,576,180 shares of outstanding common stock were exchanged on a share-for-share basis for shares of non-voting common stock. As of December 31, 2012, the number of outstanding non-voting common stock had decreased to 1,669,205. In February 2013, all of the remaining outstanding shares of non-voting common stock were converted to voting shares in accordance with the Stock Distribution Agreement.

Preferred Stock

The Company’s board of directors has the authority, without further action by the Company’s stockholders, to issue up to 10,000,000 shares of preferred stock in one or more series and to fix the rights, preferences, privileges and restrictions thereof. These rights, preferences and privileges could include dividend rights, conversion rights, voting rights, terms of redemption, liquidation preferences, sinking fund terms and the number of shares constituting any series or the designation of such series, any or all of which may be greater than the rights of common stock. The Company’s issuance of preferred stock could adversely affect the voting power of holders of common stock and the likelihood that such holders will receive dividend payments and payments upon liquidation. In addition, the issuance of preferred stock could have the effect of delaying, deferring or preventing a change of control of the Company or other corporate action. As of December 31, 2012 and 2011, there were no shares of preferred stock outstanding.

Prior to the Company’s IPO and related recapitalization on June 1, 2011, there were issued and outstanding 100,000 shares of Class A preferred stock, 2,850 shares of Class B preferred stock, 20,848,847 shares of Class A common stock and 5,964,489 shares of Class B common stock. In the recapitalization consummated on June 1, 2011, all shares of preferred stock and all notes not repaid with the net proceeds received by the Company in the IPO were exchanged for shares of common stock in accordance with the Recapitalization Agreement. In addition, each share of Class B common stock was exchanged for one share of common stock. See Note 18.

8. Stock-Based Compensation

The Company has stock plans under which directors, officers, key employees, and consultants of the Company may be granted restricted stock awards, stock options and other equity-based instruments as a means of promoting the Company’s long-term growth and profitability. The plans are intended to encourage participants to contribute to and participate in the success of the Company.

The Company's board of directors adopted, and the Company's stockholders approved, the Amended and Restated 2005 Incentive Stock Plan, or the 2005 Stock Plan, effective January 1, 2008. The total number of shares of common stock authorized for issue pursuant to awards granted under the 2005 Stock Plan was 2,500,000 shares. The 2005 Stock Plan provided for the grant of non-qualified stock options, stock appreciation rights, restricted stock, performance shares, phantom stock, restricted stock units and other awards that are valued in whole or in part by reference to the Company's stock.

72

Notes to Financial Statements—(Continued)

On May 9, 2011, the Company's board of directors adopted, and the Company's stockholders approved, the 2011 Equity Incentive Award Plan, or 2011 Plan. Under the 2011 Plan, 3,000,000 new shares of common stock are reserved for issuance pursuant to a variety of stock-based compensation awards, including stock options, stock appreciation rights or SARs, restricted stock awards, restricted stock unit awards, deferred stock awards, dividend equivalent awards, stock payment awards and performance share awards and other stock-based awards, plus the number of shares remaining available for future awards under our 2005 Stock Plan. The number of shares reserved for issuance or transfer pursuant to awards under the 2011 Plan will be increased by the number of shares represented by awards outstanding under the Company's 2005 Stock Plan that are forfeited or lapse unexercised and which, following the effective date of the 2011 Plan, are not issued under the Company's 2005 Stock Plan. No further awards will be granted under the 2005 Stock Plan, and all outstanding awards will continue to be governed by their existing terms. As of December 31, 2012 and December 31, 2011, 2,689,490 and 3,336,614 shares of the Company’s common stock, respectively, remained available for future issuance under the 2011 Plan.

Restricted stock and restricted stock unit awards are valued at the fair value of the shares on the date of grant if vesting is based on a service or a performance condition. Granted shares and units vest 25% per year on each anniversary of issuance. Each restricted stock unit represents the right to receive one share of common stock upon vesting of such restricted stock unit. Compensation expense is recognized on a straight-line basis over the requisite service period.

Stock option awards are granted with an exercise price equal to the fair market value of the Company’s common stock at the date of grant, vest over four years of continuous service, and have ten-year contractual terms. The fair value of each stock option award is estimated on the date of grant using the Black Scholes model. There were no options granted during 2012. For option grants during 2011, the Company’s weighted average assumptions for expected volatility, dividends, term, and risk-free interest rate were 46.25%, 0%, 6.25 years and 2.03%, respectively. For option grants during 2010, the Company’s weighted average assumptions for expected volatility, dividends, term, and risk-free interest rate were 51.6%, 0%, 6.25 years and 2.12%, respectively. Expected volatilities are based on the historical volatility of a group of peer entities within the same industry. The expected term of options is based upon the simplified method, which represents the average of the vesting term and the contractual term. The risk-free interest rate is based on U.S. Treasury yields for securities with terms approximating the expected term of the option.

Prior to the Company's IPO, to the extent a market price was not available, the fair value of the Company’s common stock was estimated using a discounted cash flow analysis and market multiples, based on management’s estimates of revenue, driven by assumed market growth rates, and estimated costs as well as appropriate discount rates. These estimates are consistent with the plans and estimates management uses to manage the Company’s business. Share-based compensation cost is included within salaries, wages and benefits in operating expenses in the accompanying statements of operations and amounted to $4.3 million, $0.5 million and $0.6 million for 2012, 2011, and 2010 respectively. During 2012, 2011, and 2010, there was $1.6 million, $0.2 million and $0.4 million tax benefit recognized in income, respectively.

A summary of share option activity under the 2011 Plan as of December 31, 2012 and changes during the year endedDecember 31, 2012 is presented below:

	Number of Shares		Weighted- Average Exercise Price ($)	Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value ($000)
Outstanding at December 31, 2011	312,000		9.33	8.9	1,946
Exercised	(57,725	)	8.16
Forfeited or expired	(6,625	)	9.74
Outstanding at December 31, 2012	247,650		9.59	8.0	2,015
Exercisable at December 31, 2012	70,900		9.29	7.9	598
Vested or Expected to Vest at December 31, 2012	238,932		9.56	8.0	1,951

There were no options granted during the year ended December 31, 2012. The weighted-average fair value of option awards granted during the years ended December 31, 2011 and 2010 was $5.73, and $4.06, respectively. The total intrinsic value of share options exercised during the years ended December 31, 2012 and 2011 was $0.7 million and $0.2 million, respectively. There were no options exercised during the year ended December 31, 2010. The total fair value of shares vested during the years ended December 31, 2012, 2011 and 2010 was $0.4 million, $0.3 million and $0.2 million, respectively.

73

Notes to Financial Statements—(Continued)

A summary of the status of the Company’s restricted stock shares (restricted stock awards and restricted stock unit awards) as of December 31, 2012 and changes during the year endedDecember 31, 2012 is presented below:

	Number of Shares		Weighted-Average Grant Date Fair Value ($)
Outstanding at December 31, 2011	271,999		1.43
Granted	391,418		20.01
Vested	(197,613	)	2.67
Forfeited	(16,175	)	4.79
Outstanding at December 31, 2012	449,629		16.94

The weighted-average fair value of restricted stock granted during the years ended December 31, 2012 and 2010 was $20.01 and $6.39, respectively. There was no restricted stock granted during the year ended December 31, 2011. The total fair value of restricted stock shares vested during the years ended December 31, 2012, 2011 and 2010 was $3.9 million, $3.2 million, and $2.2 million respectively.

As of December 31, 2012 and December 31, 2011, there was $6.8 million and $1.3 million, respectively, of total unrecognized compensation cost related to nonvested restricted stock and options expected to be recognized over a weighted-average period of 3.1 years and 2.6 years, respectively.

Performance Share Awards

During 2012, the Company granted certain senior-level executives restricted stock units that vest based on market and service conditions as part of a long-term incentive plan, which are referred to herein as performance share awards. The number of shares of common stock underlying each award is determined at the end of a three-year performance period. In order to vest, the senior level executive must still be employed by the Company, with certain contractual exclusions, at the end of the performance period. At the end of the performance period, the percentage of the stock units that will vest will be determined by ranking the Company’s total shareholder return compared to the total shareholder return of 12 peer companies. Based on the level of performance, between 0% and 200% of the award may vest. Within 60 days after vesting, the shares underlying the award will be issued to the participant. In the event of a change in control of the Company or the disability or death of a participant, the payout of any award is limited to a pro-rated portion of such award based upon a performance assessment prior to the change-in-control date or date of disability or death.

The market condition requirements are reflected in the grant date fair value of the award, and the compensation expense for the award will be recognized assuming that the requisite service is rendered regardless of whether the market conditions are achieved.

The grant date fair value of the performance share awards was determined through the use of a Monte Carlo simulation model, which utilizes multiple input variables that determine the probability of satisfying the market condition requirements applicable to each award as follows:

	Weighted-Average at Grant Date
Expected volatility factor	0.39
Risk free interest rate	0.44	%
Expected term (in years)	2.72
Expected dividend yield	—	%

At the time of the performance share award grants, the Company had been public for less than one year; as such, the volatility was based upon a weighted average of the volatility for the Company and the most recent volatility of its peers. The peer group used to calculate volatility is consistent with the group used for the traditional employee stock options. The Company chose to use historical volatility to value these awards because historical stock prices were used to develop the correlation coefficients between the Company and each of the peer companies within the peer group in order to model stock price movements. The volatilities used were calculated over the most recent period, which was the remaining term of the performance period at the date of grant. The risk-free interest rate was based on the implied yield available on U.S. Treasury zero-coupon issues with remaining terms equivalent to the remaining performance period. The Company does not intend to pay dividends on its common stock in the foreseeable future. Accordingly, the Company used a dividend yield of zero in its model.

74

Notes to Financial Statements—(Continued)

The following table summarizes the Company’s performance share awards for the year endedDecember 31, 2012:

	Number of Awards	Weighted-Average Fair Value at Grant Date ($)
Outstanding at December 31, 2011	—	—
Granted	280,907	20.30
Vested	—	—
Forfeited	—	—
Outstanding at December 31, 2012	280,907	20.30

As of December 31, 2012, there was $6.9 million of total unrecognized compensation cost related to performance share awards. The unrecognized cost is expected to be recognized over two years.

9. Net Income per Share

The following table sets forth the computation of basic and diluted earnings per common share:

	Year Ended December 31,
	2012		2011		2010
	(in thousands, except for share and per share amounts)
Numerator
Net income	$	108,460	$	76,448	$	72,481
Denominator
Weighted-average shares outstanding, basic	72,386		53,241		26,184
Effect of dilutive stock awards	205		274		506
Adjusted weighted-average shares outstanding, diluted	72,591		53,515		26,690
Net Income per Share
Basic earnings per common share	$	1.50	$	1.44	$	2.77
Diluted earnings per common share	$	1.49	$	1.43	$	2.72

As of December 31, 2012, there were 88 thousand anti-dilutive stock awards excluded from the computation of diluted earnings per common share. As of December 31, 2011, there were 70 thousand anti-dilutive awards excluded from the computation of diluted earnings per common share.

10. Debt, Related-Party Transactions and Other Obligations

In connection with the closing of the IPO, the Company consummated the transaction contemplated by the Recapitalization Agreement on June 1, 2011, which resulted in the repayment or exchange for common stock of all of the Company’s notes and preferred stock. See Note 18. As of December 31, 2012 and 2011, there was no outstanding long term debt, long term obligations or outstanding amounts due to related parties.

The Company has a line of credit for $18.6 million and $8.6 million related to corporate credit cards, of which the Company had drawn $3.2 million and $2.4 million as of December 31, 2012 and 2011, respectively.

In addition, the Company has lines of credit with counterparties to the Company's jet fuel derivatives in the amount of $18.0 million as of December 31, 2012. Of the $18.0 million in lines of credit, $5.0 million is provided exclusively for jet fuel derivatives, $10.0 million is provided exclusively for physical fuel delivery, and the remaining $3.0 million is provided for either purpose. As of December 31, 2012, the Company had drawn $11.2 million for physical fuel delivery and had not drawn on the remaining lines. As of December 31, 2011, the Company had lines of credit with counterparties in the amount of $8 million exclusively for jet fuel derivatives. As of December 31, 2011, the Company had not drawn on the lines of credit. The Company is required to post collateral for any excess above the lines of credit if the derivatives are in a net liability position and make periodic payments in order to maintain an adequate undrawn portion for physical fuel delivery.

75

Notes to Financial Statements—(Continued)

The Company’s principal stockholders provided certain consulting services to the Company for a management fee of $0.8 million in 2010. For the year ended December 31, 2011, the Company expensed $0.3 million related to these consulting services. There were no management fees paid in 2012.

11. Leases and Prepaid Maintenance Deposits

The Company leases various types of equipment and property, primarily aircraft, spare engines and airport facilities under leases, which expire in various years through 2032. Lease terms are generally 3 to 12 years for aircraft and up to 20 years for other leased equipment and property.

Total rental expense for all leases charged to operations for the years ended 2012, 2011, and 2010 was $172.4 million, $139.1 million, and $122.7 million, respectively. Total rental expense charged to operations for aircraft and engine operating leases for the years ended December 31, 2012, 2011, and 2010 was $143.6 million, $116.5 million, and $101.3 million, respectively.

Some of the Company’s master lease agreements provide that the Company pays maintenance reserves to aircraft lessors to be held as collateral in advance of the Company’s required performance of major maintenance activities. Some maintenance reserve payments are fixed contractual amounts, while others are based on actual flight hours. Fixed maintenance reserve payments for these aircraft and related flight equipment, including estimated amounts for contractual price escalations, will be approximately $10.3 million in 2013, $10.6 million in 2014, $11.0 million in 2015, $11.4 million in 2016, $11.1 million in 2017, and $40.4 million in 2018 and beyond. These lease agreements provide that maintenance reserves are reimbursable to the Company upon completion of the maintenance event in an amount equal to the lesser of (1) the amount of the maintenance reserve held by the lessor associated with the specific maintenance event or (2) the qualifying costs related to the specific maintenance event. Substantially all of these maintenance reserve payments are calculated based on a utilization measure, such as flight hours or cycles, and are used solely to collateralize the lessor for maintenance time run off the aircraft until the completion of the maintenance of the aircraft.

At lease inception and at each balance sheet date, the Company assesses whether the maintenance reserve payments required by the master lease agreements are substantively and contractually related to the maintenance of the leased asset. Maintenance reserve payments that are substantively and contractually related to the maintenance of the leased asset are accounted for as maintenance deposits. Maintenance deposits expected to be recovered from lessors are reflected as prepaid maintenance deposits in the accompanying balance sheets. When it is not probable the Company will recover amounts currently on deposit with a lessor, such amounts are expensed as supplemental rent. As of December 31, 2012 and 2011, the Company had aircraft maintenance deposits of $198.5 million and $168.8 million, respectively, on its balance sheets of which $76.1 million and $48.2 million, respectively, are included within other current assets on its balance sheets. The Company has concluded that these prepaid maintenance deposits are probable of recovery primarily due to the rate differential between the maintenance reserve payments and the expected cost for the related next maintenance event that the reserves serve to collateralize.

The Company’s master lease agreements also provide that most maintenance reserves held by the lessor at the expiration of the lease are nonrefundable to the Company and will be retained by the lessor. Consequently, any usage-based maintenance reserve payments after the last major maintenance event are not substantively related to the maintenance of the leased asset and therefore are accounted for as contingent rent. The Company accrues for contingent rent beginning when it becomes probable and reasonably estimable the Company will incur such nonrefundable maintenance reserve payments. The Company makes certain assumptions at the inception of the lease and at each balance sheet date to determine the recoverability of maintenance deposits. These assumptions are based on various factors such as the estimated time between the maintenance events, the date the aircraft is due to be returned to the lessor, and the number of flight hours the aircraft is estimated to be utilized before it is returned to the lessor. The Company expensed $2.0 million, $1.5 million, and $0.0 million as supplemental rent during 2012, 2011, and 2010, respectively. Maintenance reserves held by lessors that are refundable to the Company at the expiration of the lease are accounted for as prepaid maintenance deposits on the balance sheet when they are paid.

At December 31, 2012, the Company had its entire fleet of 45 aircraft and eight spare engines financed under operating leases with lease term expiration dates ranging from 2016 to 2024. Five of the leased aircraft have variable rent payments, which fluctuate based on changes in LIBOR (London Interbank Offered Rate). The Company has the option to renew 17 of the leases for three-year periods with contractual notice required in the 10th year. 16 of the aircraft leases and all of the engine leases were the result of sale-lease-back transactions. Deferred gains or losses from sale-lease-back transactions are amortized over the term of the lease as a reduction in rent or additional rent, respectively. Losses are deferred when the fair value of the aircraft or engine is higher than the price it was sold for, in substance, a prepayment of rent. A loss on disposal is recorded at the time of sale for the excess of the carrying amount over the fair value of the aircraft or engine. The costs of returning aircraft to lessors, or lease return conditions, are accounted for in a manner similar to the accounting for contingent rent. These costs

76

Notes to Financial Statements—(Continued)

are recognized over the remaining life of the lease as aircraft hours accumulate, beginning from the time when the Company determines it is probable such costs will be incurred and can generally be estimated. Such estimated costs exclude the costs of maintenance events that are covered by reserves on deposit with the relevant lessor, or routine maintenance costs that are recorded in maintenance expense.

During 2012, the Company entered into sale and leaseback transactions with third-party aircraft lessors for the sale and leaseback of seven Airbus A320 aircraft that resulted in deferred losses of $5.0 million, which are included in deferred heavy maintenance and other long-term assets within the balance sheet. The deferred losses will be recognized as rent expense on a straight-line basis over the term of the respective operating leases. The Company had agreements in place prior to the delivery of these aircraft which resulted in the settlement of the purchase obligation by the lessor and the refund of $40.5 million in pre-delivery deposits from Airbus during 2012. The refunded pre-delivery deposits have been disclosed in the statement of cash flows as investing activities within pre-delivery deposits, net of refunds. In addition, the Company entered into sale and leaseback transactions with third-party lessors for the sale and leaseback of two V2500 IAE International Aero Engines AG engines. Cash outflows related to the purchase of the engine have been disclosed in the statement of cash flows as investing activities within purchases of property and equipment and the cash inflows from the sale of the engine as financing activities within proceeds received on sale lease back transactions. All of the leases from these sale and leaseback transactions are accounted for as operating leases. Under the terms of the lease agreements, the Company will continue to operate and maintain the aircraft. Payments under the lease agreements are fixed for the term of the lease. The lease agreements contain standard termination events, including termination upon a breach of the Company's obligations to make rental payments and upon any other material breach of the Company's obligations under the leases, and standard maintenance and return condition provisions. Upon a termination of the lease due to a breach by the Company, the Company would be liable for standard contractual damages, possibly including damages suffered by the lessor in connection with remarketing the aircraft or while the aircraft is not leased to another party.

Future minimum lease payments under noncancelable operating leases with initial or remaining terms in excess of one year at December 31, 2012 were as follows:

	Operating Leases
As of December 31,	Aircraft and Spare Engine Leases		Property Facility Leases		Total Operating Leases
	(in thousands)
2013	$	152,558	$	15,799	$	168,357
2014	152,575		13,964		166,539
2015	152,961		11,958		164,919
2016	152,801		7,553		160,354
2017	131,849		3,779		135,628
2018 and thereafter	358,310		20,717		379,027
Total minimum lease payments	$	1,101,054	$	73,770	$	1,174,824

12. Financial Instruments and Risk Management

As part of the Company’s risk management program, the Company from time to time uses a variety of financial instruments to reduce its exposure to fluctuations in the price of jet fuel. The Company does not hold or issue derivative financial instruments for trading purposes.

The Company is exposed to credit losses in the event of nonperformance by counterparties to these financial instruments. The Company periodically reviews and seeks to mitigate exposure to the financial deterioration and nonperformance of any counterparty by monitoring the absolute exposure levels, each counterparty's credit ratings, and the historical performance of the counterparties relating to hedge transactions. The credit exposure related to these financial instruments is limited to the fair value of contracts in a net receivable position at the reporting date. The Company also maintains security agreements that require the Company to post collateral if the value of selected instruments falls below specified mark-to-market thresholds.

The Company records financial derivative instruments at fair value, which includes an evaluation each counterparty's credit risk. Fair value of the instruments is determined using standard option valuation models.

Management chose not to elect hedge accounting on any derivative instruments entered into during 2012, 2011, and 2010 and, as a result, changes in the fair value of these fuel hedge contracts are recorded each period in aircraft fuel expense.

77

Notes to Financial Statements—(Continued)

The following table summarizes the components of aircraft fuel expense for the years ended December 31, 2012, 2011 and 2010:

	Year Ended December 31,
	2012		2011			2010
	(in thousands)
Into-plane fuel cost	$	471,542	$	392,278		$	251,754
Settlement losses (gains)	175		(7,436		)	(1,483		)
Unrealized mark-to-market losses (gains)	46		3,204			(2,065		)
Aircraft fuel	$	471,763	$	388,046		$	248,206

All realized gains and losses are reflected in the statements of cash flows in cash flow from operating activities.

As of December 31, 2012 and 2011, the Company had fuel hedges using U.S. Gulf Coast jet fuel collars as the underlying commodity. As of December 31, 2012, the Company had agreements in place to protect 7.8 milliongallons or approximately 5% of its 2013 anticipated fuel consumption at a weighted-average ceiling and floor price of $3.09 and $2.84 per gallon, respectively. As of December 31, 2011, the Company had agreements in place to protect 13.5 milliongallons or approximately 9% of its 2012 anticipated fuel consumption at a weighted-average ceiling and floor price of $2.99 and $2.81 per gallon, respectively.

13. Defined Contribution 401(k) Plan

The Company sponsors three defined contribution 401(k) plans, Spirit Airlines, Inc. Employee Retirement Savings Plan (first plan), Spirit Airlines, Inc. Pilots’ Retirement Savings Plan (second plan), and Spirit Airlines, Inc. Puerto Rico Retirement Savings Plan (third plan). The first plan was adopted on February 1, 1994. Essentially, all employees that are not covered by the pilots’ collective bargaining agreement, who have at least one year of service, have worked at least 1,000 hours during the year, and have attained the age of 21 may participate in this plan. The Company may make a Qualified Discretionary Contribution, as defined in the plan, or provide matching contributions to this plan. Effective July 1, 2007, the Company amended this plan to change the service requirement to 60 days and provided for matching contribution to the plan at 50% of the employee’s contribution up to a maximum employer contribution of 3% of the employee’s annual compensation.

The second plan is for the Company’s pilots, and contained the same service requirements as the first plan and was amended effective July 1, 2007, to change the service requirements to 60 days and having attained the age of 21. The Company matches 100% of the pilot’s contribution, up to 8% of the individual pilot’s annual compensation. Both the first and the second plans are subject to the annual IRS elective deferral limit, which was $17 thousand for 2012.

The third plan is for all Company employees residing in Puerto Rico and was adopted on April 16, 2012. It contains the same amended service requirements as the first and second plans. For pilots participating in the Puerto Rico plan, the Company matches 100% of their contribution, up to 8% of the individual pilot's annual compensation, but subject to the annual Puerto Rico pre-tax elective deferral limit, which was $13 thousand for 2012. For all other employees participating in the Puerto Rico plan, the Company provides for matching contribution to the plan at 50% of the employee's contribution up to a maximum employer contribution of 3% of the employee's annual compensation.

Matching contributions made to all plans were $6.6 million , $4.9 million and $4.8 million in 2012, 2011 and 2010, respectively, and were included within salaries, wages and benefits in the accompanying statements of operations.

78

Notes to Financial Statements—(Continued)

14. Income Taxes

Significant components of the provision for income taxes from continuing operations are as follows:

	For the Years Ended December 31,
	2012		2011		2010
	(in thousands)
Current:
Federal	$	32,656	$	1,866	$	258
State and local	3,250		74		68
Foreign	963		263		189
Total current expense	36,869		2,203		515
Deferred:
Federal	27,870		42,148		(48,934		)
State and local	1,385		2,032		(3,877		)
Total deferred expense (benefit)	29,255		44,180		(52,811		)
Total income tax expense (benefit)	$	66,124	$	46,383	$	(52,296	)

The reconciliation of income tax expense computed at the federal statutory tax rates to income tax expense from continuing operations is as follows:

	For the Years Ended December 31,
	2012			2011			2010
	(in thousands)
Expected provision at federal statutory tax rate	$	61,104		$	42,991		$	7,062
State and foreign tax expense, net of federal benefit	3,726			2,255			413
Interest and dividend on preferred stock	—			710			1,612
Change in valuation allowance	—			—			(65,248		)
Meals and entertainment	649			469			315
Fines and penalties	84			(36		)	9
Federal credits	—			(103		)	(156		)
Adjustment to deferred tax assets and liabilities	(3		)	(3		)	3,486
Other	564			100			211
Total income tax expense (benefit)	$	66,124		$	46,383		$	(52,296	)

79

Notes to Financial Statements—(Continued)

At December 31, 2012 and 2011, the significant components of the Company's deferred taxes consisted of the following:

	December 31,
	2012			2011
	(in thousands)
Deferred tax assets:
Net operating loss	$	83		$	6,234
Deferred loss	—			1,440
Deferred revenue	5,829			5,985
Federal tax credits	—			3,176
Nondeductible accruals	6,744			5,452
Other	1,072			306
Gross deferred tax assets	13,728			22,593
Deferred tax assets, net	13,728			22,593
Deferred tax liabilities:
Capitalized interest	(1,125		)	(2,041		)
Deferred gain	(364		)	—
Fuel hedging	(97		)	(115		)
Accrued engine maintenance	(29,497		)	(10,232		)
Property, plant, and equipment	(3,271		)	(1,575		)
Gross deferred tax liabilities	(34,354		)	(13,963		)
Net deferred tax assets (liabilities)	$	(20,626	)	$	8,630
Deferred taxes included within:
Assets:
Other current assets	$	12,591		$	20,738
Liabilities:
Other long-term liabilities	(33,216		)	(12,108		)

In assessing the realizability of the deferred tax assets, management considered whether it is more likely than not that some or all of the deferred tax assets would be realized. In evaluating the Company's ability to utilize its deferred tax assets, it considered all available evidence, both positive and negative, in determining future taxable income on a jurisdiction by jurisdiction basis.

Based on the expectation of future taxable income, the availability of reversing deferred tax liabilities, combined with achieving sustained profitability, management determined that, as of December 31, 2010, all of the Company's deferred tax assets would be realized in taxable years after 2010. Based on this determination the Company eliminated its valuation allowance, which resulted in a reduction to the valuation allowance of $65.2 million, the recognition of a deferred tax benefit of $52.8 million, and a total income tax benefit of $52.3 million for the period ending December 31, 2010.

At December 31, 2011, the Company had available for federal income tax purposes an alternative minimum tax (“AMT”) credit carryforward of approximately $3.2 million, and net operating loss (“NOL”) carryforwards for federal income tax purposes of $20.8 million. The Company's NOL carryforwards at December 31, 2011 included an unrealized benefit of approximately $3.5 million related to share-based compensation that was recorded in equity during 2012. In accordance with ASC 718, excess tax benefits are only recognized in the financial statements upon actual realization of the related tax benefit, which occurred in 2012 upon utilization of the remaining NOLs and AMT credit carryforwards during the year.

The Company has fully utilized its AMT credit carryforwards of approximately $3.2 million and NOL carryforwards of approximately $20.8 million against federal taxable income as of December 31, 2012. The Company has state NOL carryforwards of approximately $2.2 million which can be used to offset future state taxable income. State net operating losses begin to expire in 2017.

During 2012 the Company recorded a foreign tax credit of $1.0 million against its 2012 federal income tax liability which was fully utilized during the year. Previously the Company deducted income taxes paid in foreign countries in arriving at federal taxable income.

80

Notes to Financial Statements—(Continued)

On January 25, 2012, the Company experienced a subsequent ownership change under the principles of IRC §382, as a result of the secondary offering outlined in more detail in Note 3. Although the Company was subject to the limitations of IRC §382 on the utilization of its NOL and the tax credit carryforwards in 2012, the limitation was sufficiently in excess of the tax attribute carryforwards to allow complete utilization during the year.

The Company accrues interest related to unrecognized tax benefits in its provision for income taxes, and any associated penalties are recorded in selling, general and administrative expenses.

The Company files its tax returns as prescribed by the tax laws of the jurisdictions in which it operates. The Company's tax years from 2005 through 2011 are still subject to examination in the United States due to net operating loss carryovers generated in such years. Various state and foreign jurisdiction tax years remain open to examination and the Company was under examination in certain jurisdictions during 2012 the outcome of these audits were immaterial to the financial statements. The Company believes that the effect of any additional assessment(s) will be immaterial to its financial statements.

15. Commitments and Contingencies

Aircraft-Related Commitments and Financing Arrangements

The Company’s contractual purchase commitments consist primarily of aircraft and engine acquisitions through manufacturers and aircraft leasing companies. As of December 31, 2012, firm aircraft orders with Airbus and a third party consisted of 106 A320 family aircraft (two used A319 aircraft, 54 of the existing A320 aircraft model and 50 A320 NEOs) and engine orders with International Aero Engines consisted of three spare V2500 IAE International Aero Engines AG engines. Aircraft are scheduled for delivery from 2013 through 2021, and spare engines are scheduled for delivery from 2013 through 2015. Committed expenditures for these aircraft and related flight equipment, including estimated amounts for contractual price escalations and pre-delivery payments, will be approximately $323 million in 2013, $354 million in 2014, $523 million in 2015, $505 million in 2016, $613 million in 2017 and $2,339 million in 2018 and beyond.

Litigation

The Company is subject to commercial litigation claims and to administrative and regulatory proceedings and reviews that may be asserted or maintained from time to time. The Company believes the ultimate outcome of such lawsuits, proceedings and reviews will not, individually or in the aggregate, have a material adverse effect on its financial position, liquidity or results of operations.

Employees

The Company has three union-represented employee groups that together represent approximately 54% of all employees at December 31, 2012 and 52% of all employees at December 31, 2011. The table below sets forth the Company's employee groups and status of the collective bargaining agreements.

Employee Groups	Representative	Amendable Date
Pilots	Air Line Pilots Association, International (ALPA)	August 2015
Flight Attendants	Association of Flight Attendants (AFA-CWA)	August 2007
Dispatchers	Transport Workers Union (TWU)	July 2012

The collective bargaining agreement between the Company and the Company’s pilots represents 22% of the Company’s employees as of December 31, 2012.

The collective bargaining agreement between the Company and the Company’s flight attendants represents approximately 31% of the Company’s employees as of December 31, 2012. The Company and the AFA-CWA are currently in negotiations to reach a new collective bargaining agreement.

The collective bargaining agreement between the Company and its dispatchers represents approximately 1% of the Company’s employees as of December 31, 2012.

The Company is self-insured for health care claims for eligible participating employees and qualified dependent medical claims, subject to deductibles and limitations. The Company’s liabilities for claims incurred but not reported are determined based on an estimate of the ultimate aggregate liability for claims incurred. The estimate is calculated from actual claim rates

81

Notes to Financial Statements—(Continued)

and adjusted periodically as necessary. The Company has accrued $1.9 million, $2.0 million, and $2.1 million for health care claims as of December 31, 2012, 2011 and 2010, respectively.

Other

The Company is contractually obligated to pay the following minimum guaranteed payments to the provider of its reservation system as of December 31, 2012: $3.1 million in 2013, $3.7 million in 2014, $3.7 million in 2015, $3.7 million in 2016, $3.7 million in 2017 and $2.5 million in 2018 and thereafter.

The Company entered into a Tax Receivable Agreement (“TRA”) with the Company's Pre-IPO Stockholders (as defined in the TRA) that became effective immediately prior to the consummation of the IPO. In accordance with the TRA, the Company paid $27.2 million, including $0.3 million of applicable interest, in the second quarter of 2012. See Note 18.

16. Fair Value Measurements

Under ASC 820, Fair Value Measurements and Disclosures, disclosures are required about how fair value is determined for assets and liabilities, and a hierarchy for which these assets and liabilities must be grouped is established, based on significant levels of inputs, as follows:

Level 1—Quoted prices in active markets for identical assets or liabilities.

Level 2—Observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The Company utilizes several valuation techniques in order to assess the fair value of the Company’s financial assets and liabilities. The Company’s fuel derivative contracts, which primarily consist of costless collar contracts, are valued using energy and commodity market data, which is derived by combining raw inputs with quantitative models and processes to generate forward curves and volatilities.

The Company utilizes the market approach to measure fair value for its financial assets and liabilities. The market approach uses prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities.

Assets and liabilities measured at fair value on a recurring basis are summarized below:

	Fair Value Measurements as of December 31, 2012
	Total		Level 1		Level 2		Level 3
	(in millions)
Cash and cash equivalents	$	416.8	$	416.8	$	—	$	—
Option contracts	0.3		—		—		0.3
Total assets	$	417.1	$	416.8	$	—	$	0.3
Total liabilities	$	—	$	—	$	—	$	—

82

Notes to Financial Statements—(Continued)

	Fair Value Measurements as of December 31, 2011
	Total		Level 1		Level 2		Level 3
	(in millions)
Cash and cash equivalents	$	343.3	$	343.3	$	—	$	—
Option contracts	1.0		—		—		1.0
Total assets	$	344.3	$	343.3	$	—	$	1.0
Option contracts	0.7		$	—	$	—	$	0.7
Total liabilities	$	0.7	$	—	$	—	$	0.7

Cash and cash equivalents at December 31, 2012 and December 31, 2011 are comprised of liquid money market funds and cash. The Company maintains cash with various high-quality financial institutions. The Company had no transfers of assets or liabilities between any of the above levels during the years ended December 31, 2012 and 2011.

The Company did not elect hedge accounting on any of the derivative instruments, and as a result, changes in the fair values of these fuel hedge contracts are recorded each period in fuel expense. Fair values of the instruments are determined using standard option valuation models. The Company also considers counterparty risk and its own credit risk in its determination of all estimated fair values. The Company offsets fair value amounts recognized for derivative instruments executed with the same counterparty under a master netting arrangement. The Company determines the fair value of fuel derivative option contracts utilizing an option pricing model based on inputs that are either readily available in public markets or can be derived from information available in publicly quoted markets. The Company has consistently applied these valuation techniques in all periods presented and believes it has obtained the most accurate information available for the types of derivative contracts it holds.

Due to the fact that certain inputs utilized to determine the fair value of aircraft fuel derivatives are unobservable (principally implied volatility), the Company has categorized these derivatives as Level 3. Implied volatility of an option contract is the volatility of the price of the underlying that is implied by the market price of the option based on an option pricing model. Thus, it is the volatility that, when used in a particular pricing model, yields a theoretical value for the option equal to the current market price of that option. Implied volatility, a forward-looking measure, differs from historical volatility because the latter is calculated from known past returns. At each balance sheet date, the Company substantiates and adjusts unobservable inputs. The Company routinely assesses the valuation model's sensitivity to changes in implied volatility. Based on the Company's assessment of the valuation model's sensitivity to changes in implied volatility, it noted that holding other inputs constant, a significant increase (decrease) in implied volatility would result in a significantly higher (lower) determination of fair value measurement for the Company's aircraft fuel derivatives.

The Company's Valuation Group is made up of individuals from the Company's Risk Management, Treasury and Corporate Accounting departments. The Valuation Group is responsible for the Company's valuation policies, procedures and execution thereof. The Company's Valuation Group reports to the Company's Chief Financial Officer and Audit Committee who approve all derivative transactions. The Valuation Group compares the results of the Company's internally developed valuation methods with counterparty reports at each balance sheet date and assesses the Company's valuation methods for accurateness and identifies any needs for modification.

83

Notes to Financial Statements—(Continued)

The following table presents the Company’s activity for assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3):

	Fuel Derivatives
	(in millions)
Balance at January 1, 2010	$	1.4
Total realized or unrealized gains (losses) included in earnings, net	3.5
Settlements, net	(1.4		)
Balance at December 31, 2010	3.5
Total realized or unrealized gains (losses) included in earnings, net	4.2
Settlements, net	(7.4		)
Balance at December 31, 2011	0.3
Total realized or unrealized gains (losses) included in earnings, net	(0.2		)
Settlements, net	0.2
Balance at December 31, 2012	$	0.3

The Company records the fair value adjustment of its aircraft fuel derivatives in the accompanying statement of operations within aircraft fuel and on the balance sheet within other current assets or other current liabilities, depending on whether the net fair value of the derivatives is in an asset or liability position as of the respective date.

17. Operating Segments and Related Disclosures

The Company is managed as a single business unit that provides air transportation for passengers. Operating revenues by geographic region as defined by the Department of Transportation (DOT) area are summarized below:

	2012		2011		2010
	(in millions)
DOT—domestic	$	1,135.1	$	900.1	$	625.0
DOT—Latin America	183.3		171.1		156.3
Total	$	1,318.4	$	1,071.2	$	781.3

During 2012, 2011, and 2010, no revenue from any one foreign country represented greater than 4% of the Company’s total passenger revenue. The Company attributes operating revenues by geographic region based upon the origin and destination of each passenger flight segment. The Company’s tangible assets consist primarily of flight equipment, which are mobile across geographic markets and, therefore, have not been allocated.

18. Initial Public Offering and Tax Receivable Agreement

On June 1, 2011, the Company raised $187.2 million of gross proceeds from an initial public offering of 15,600,000 shares of its common stock at a price of $12.00 per share. The resulting proceeds to the Company were approximately $176.9 million, after deducting underwriter commissions. The Company retained $150.0 million of the net proceeds, after paying $20.6 million of debt, $0.5 million to pay three unaffiliated holders of its subordinated notes, and $5.9 million in direct costs of the offering. In accordance with a Recapitalization Agreement, all of the principal and accrued and unpaid interest on outstanding notes, to the extent not paid, totaling $279.2 million, as well as all of the Class A and B preferred stock outstanding immediately prior to the offering along with accrued and unpaid dividends totaling $81.7 million, were exchanged for 30,079,420 shares of common stock at a share price of $12.00 per share. Each share of Class B Common Stock was exchanged for one share of common stock. In addition, interest expense was reduced by $0.4 million due to a write off of the unamortized portion of prepaid loan fees and deferred interest.

The Company entered into the TRA with the Pre-IPO Stockholders effective immediately prior to the consummation of the IPO. Under the TRA, the Company is obligated to pay to the Pre-IPO Stockholders an amount equal to 90% of the cash savings in federal income tax realized by it by virtue of the use of the federal net operating loss, deferred interest deductions and alternative minimum tax credits held by the Company as of March 31, 2011. Cash tax savings generally will be computed by comparing actual federal income tax liability to the amount of such taxes that the Company would have been required to pay had such Pre-IPO NOLs (as defined in the TRA) not been available. Upon consummation of the IPO and execution of the TRA, the Company recorded a liability with an offsetting reduction to additional paid in capital. During 2012, management adjusted

84

Notes to Financial Statements—(Continued)

for an immaterial error in the original estimation of the liability. This adjustment reduced the liability with an offset to additional paid in capital.

The term of the TRA will continue until the first to occur of (a) the full payment of all amounts required under the agreement with respect to utilization or expiration of all of the Pre-IPO NOLs, (b) the end of the taxable year including the tenth anniversary of the IPO or (c) a change in control of the Company. The amount and timing of payments under the TRA will depend upon a number of factors, including, but not limited to, the amount and timing of taxable income generated in the future and any future limitations that may be imposed on the Company's ability to use the Pre-IPO NOLs. The Company paid $27.2 million, or 90% of the tax savings realized from the utilization of NOLs in 2011, including $0.3 million of applicable interest in 2012 related to the TRA. As of December 31, 2012 an estimated remaining cash benefit of $8.0 million is expected to be paid to the Pre-IPO Stockholders under the terms of the TRA in 2013.

19. Quarterly Financial Data (Unaudited)

Quarterly results of operations for the year ended December 31, 2012 are summarized below:

	Three Months Ended
	March 31		June 30		September 30		December 31
	(in thousands, except per share amounts)
2012
Operating revenue	$	301,495	$	346,308	$	342,317	$	328,268
Operating income	37,244		55,132		49,681		31,933
Net income	23,419		34,591		30,884		19,566
Basic earnings per share	0.32		0.48		0.43		0.27
Diluted earnings per share	0.32		0.48		0.43		0.27
2011
Operating revenue	$	232,662	$	275,891	$	288,714	$	273,919
Operating income	26,844		34,959		44,556		38,023
Net income	7,883		16,917		27,657		23,991
Basic earnings per share	0.30		0.41		0.38		0.33
Diluted earnings per share	0.30		0.41		0.38		0.33

85

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Board of Directors and Stockholders of

Spirit Airlines, Inc.

We have audited the accompanying balance sheets of Spirit Airlines, Inc. as of December 31, 2012 and 2011, and the related statements of operations, shareholders' equity (deficit), and cash flows for each of the three years in the period ended December 31, 2012. These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in all material respects, the financial position of Spirit Airlines, Inc. at December 31, 2012 and 2011, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2012, in conformity with U.S. generally accepted accounting principles.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), Spirit Airlines, Inc.'s internal control over financial reporting as of December 31, 2012, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated February 25, 2013 expressed an unqualified opinion thereon.

/s/ Ernst & Young LLP

Certified Public Accountants

Miami, Florida

February 25, 2013

86

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Board of Directors and Stockholders of

Spirit Airlines, Inc.

We have audited Spirit Airlines, Inc's internal control over financial reporting as of December 31, 2012 based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (the COSO criteria). Spirit Airlines, Inc's management is responsible for maintaining effective internal control over financial reporting, and for its assessment of the effectiveness of internal control over financial reporting included in the accompanying Management's Report on Internal Control Over Financial Reporting. Our responsibility is to express an opinion on the company's internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

A company's internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company's internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of the company's assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

In our opinion, Spirit Airlines, Inc. maintained, in all material respects, effective internal control over financial reporting as of December 31, 2012, based onthe COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the accompanying balance sheet of Spirit Airlines, Inc. as of December 31, 2012 and 2011, and the related statement of operations, shareholders equity (deficit), and cash flows for each of the three years in the period ended December 31, 2012 of Spirit Airlines, Inc. and our report dated February 25, 2013 expressed an unqualified opinion thereon.

/s/ Ernst & Young LLP

Certified Public Accountants

Miami, Florida

February 25, 2013

87

ITEM 9.    CHANGES AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE

None.

ITEM 9A.    CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

Our management, with the participation of our Chief Executive Officer and our Chief Financial Officer, evaluated the effectiveness of our disclosure controls and procedures as of December 31, 2012. The term “disclosure controls and procedures,” as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act, means controls and other procedures of a company that are designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported, within the time periods specified in the SEC’s rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is accumulated and communicated to the Company’s management, including its principal executive and principal financial officers, as appropriate to allow timely decisions regarding required disclosure.

Management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving their objectives and management necessarily applies its judgment in evaluating the cost-benefit relationship of possible controls and procedures. Based on the evaluation of our disclosure controls and procedures as of December 31, 2012, our Chief Executive Officer and Chief Financial Officer concluded that, as of such date, our disclosure controls and procedures were effective at the reasonable assurance level.

Management's Annual Report on Internal Control Over Financial Reporting

Management is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Securities Exchange Act of 1934. Our internal control over financial reporting is designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with accounting principles generally accepted in the United States of America.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies may deteriorate.

Management conducted an evaluation of the effectiveness of our internal control over financial reporting as of December 31, 2012 using the criteria issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) in Internal Control-Integrated Framework. Based on that evaluation, management believes that our internal control over financial reporting was effective as of December 31, 2012.

The effectiveness of our internal control over financial reporting as of December 31, 2012 has been audited by Ernst & Young LLP, an independent registered public accounting firm, which also audited our Consolidated Financial Statements for the year ended December 31, 2012. Ernst & Young LLP's report on our internal control over financial reporting, which is included herein.

Changes in Internal Control over Financial Reporting

There were no changes in our internal control over financial reporting during 2012 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

ITEM 9B.    OTHER INFORMATION

None.

88

PART III

ITEM 10.    DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

The information under the captions, “Election of Directors,” “Corporate Governance,” “Committee and Meetings of the Board of Directors,” “Executive Officers,” “Code of Ethics” and “Section 16(a) Beneficial Ownership Reporting Compliance” in our 2013 Proxy Statement is incorporated herein by reference.

ITEM 11.    EXECUTIVE COMPENSATION

The information under the captions, “Director Compensation” and “Executive Compensation” in our 2013 Proxy Statement is incorporated herein by reference.

ITEM 12.    SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS

The information under the captions, “Security Ownership” and “Equity Compensation Plan Information” in our 2013 Proxy Statement is incorporated herein by reference.

ITEM 13.    CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

The information under the captions, “Certain Relationships and Related Transactions” and “Corporate Governance” in our 2013 Proxy Statement is incorporated herein by reference.

ITEM 14.    PRINCIPAL ACCOUNTING FEES AND SERVICES

The information under the captions, “Ratification of Independent Registered Public Accounting Firm” in our 2013 Proxy Statement is incorporated herein by reference.

With the exception of the information specifically incorporated by reference in Part III to this Annual Report on Form 10-K from our 2013 Proxy Statement, our 2013 Proxy Statement shall not be deemed to be filed as part of this Report.

89

PART IV

ITEM 15.    EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

(a) 1.  Financial Statements:

The financial statements included in Item 8. Financial Statements and Supplementary Data above are filed as part of this annual report.

     2.  Financial Statement Schedules:

There are no financial statement schedules filed as part of this annual report, since the required information is included in the Consolidated Financial Statements, including the notes thereto, or the circumstances requiring inclusion of such schedules are not present.

     3. Exhibits:

The exhibits filed as part of this Annual Report on Form 10-K are listed on the Exhibit Index included after the signature page.

90

SIGNATURES

Pursuant to the requirements of Section 13 or Section 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	SPIRIT AIRLINES, INC.
Date: February 25, 2013	By:	/s/ B. Ben Baldanza
		B. Ben Baldanza
		President and Chief Executive Officer

91

POWER OF ATTORNEY

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below constitutes and appoints B. Ben Baldanza, Edward Christie and Thomas Canfield, and each of them, their true and lawful attorneys-in-fact, each with full power of substitution, for them in any and all capacities, to sign any amendments to this report on Form 10-K and to file the same, with exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, hereby ratifying and confirming all that each of said attorneys-in-fact or their substitute or substitutes may do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed by the following persons on behalf of the registrant in the capacities and on the dates indicated

Signature	Title	Date
/s/ B. Ben Baldanza	President and Chief Executive Officer (principal executive officer)	February 25, 2013
B. Ben Baldanza
/s/ Edward M. Christie	Chief Financial Officer (principal financial and accounting officer)	February 25, 2013
Edward M. Christie
/s/ William A. Franke	Director (Chairman of the Board)	February 25, 2013
William A. Franke
/s/ Carlton D. Donaway	Director	February 25, 2013
Carlton D. Donaway
/s/ David G. Elkins	Director	February 25, 2013
David G. Elkins
/s/ H. McIntyre Gardner	Director	February 25, 2013
H. McIntyre Gardner
/s/ Robert D. Johnson	Director	February 25, 2013
Robert D. Johnson
/s/ Barclay G. Jones	Director	February 25, 2013
Barclay G. Jones
/s/ Stuart I. Oran	Director	February 25, 2013
Stuart I. Oran
/s/ Horacio Scapparone	Director	February 25, 2013
Horacio Scapparone
/s/ John R. Wilson	Director	February 25, 2013
John R. Wilson

92

EXHIBIT INDEX

Exhibit No.	Description of Exhibit
3.1	Amended and Restated Certificate of Incorporation of Spirit Airlines, Inc., dated as of June 1, 2011, filed as Exhibit 3.1 to the Company's Current Report on Form 8-K dated June 1, 2011, is hereby incorporated by reference.
3.2	Amended and Restated Bylaws of Spirit Airlines, Inc., dated as of June 1, 2011, filed as Exhibit 3.2 to the Company's Current Report on Form 8-K dated June 1, 2011, is hereby incorporated by reference.
4.1	Specimen Common Stock Certificate, filed as Exhibit 4.1 to the Company's Form S-1 Registration Statement (No. 333-178336), is hereby incorporated by reference.
4.2	Second Amended and Restated Investor Rights Agreement, dated as of July 13, 2006, among Spirit Airlines, Inc., Indigo Florida, L.P., Indigo Miramar LLC, OCM Spirit Holdings, LLC, OCM Spirit Holdings II, LLC, OCM Spirit Holdings III, LLC, OCM Spirit Holdings III-A, LLC, OCM Principal Opportunities Fund II, L.P., OCM Principal Opportunities Fund III, L.P., POF Spirit Foreign Holdings, LLC, and certain other investors, filed as Exhibit 4.2 to the Company's Form S-1 Registration Statement (No. 333-169474), is hereby incorporated by reference.
4.3	Amendment to Second Amended and Restated Investor Rights Agreement, dated as of July 20, 2010, by and among Spirit Airlines, Inc., Indigo Florida, L.P., Indigo Miramar LLC, OCM Spirit Holdings, LLC, OCM Spirit Holdings II, LLC, OCM Spirit Holdings III, LLC, OCM Spirit Holdings III-A, LLC, OCM Principal Opportunities Fund II, L.P., OCM Principal Opportunities Fund III, L.P., POF Spirit Foreign Holdings, LLC, and certain other investors, filed as Exhibit 4.3 to the Company's Form S-1 Registration Statement (No. 333-169474), is hereby incorporated by reference.
4.4	Second Amendment to Second Amended and Restated Investor Rights Agreement, dated as of February 1, 2011, by and among Spirit Airlines, Inc., Indigo Florida, L.P., Indigo Miramar LLC, OCM Spirit Holdings, LLC, OCM Spirit Holdings II, LLC, OCM Spirit Holdings III, LLC, OCM Spirit Holdings III-A, LLC, OCM Principal Opportunities Fund II, L.P., OCM Principal Opportunities Fund III, L.P., POF Spirit Foreign Holdings, LLC, and certain other investors, filed as Exhibit 4.1 to the Company's Amendment No. 4 to Form S-1 Registration Statement (No. 333-169474), is hereby incorporated by reference.
4.5	Third Amendment to Second Amended and Restated Investor Rights Agreement, dated as of May 25, 2011, by and among Spirit Airlines, Inc., Indigo Florida, L.P., Indigo Miramar LLC, OCM Spirit Holdings, LLC, OCM Spirit Holdings II, LLC, OCM Spirit Holdings III, LLC, OCM Spirit Holdings III-A, LLC, OCM Principal Opportunities Fund II, L.P., OCM Principal Opportunities Fund III, L.P., POF Spirit Foreign Holdings, LLC, and certain other investors, filed as Exhibit 10.2 to the Company's Current Report on Form 8-K dated June 1, 2011, is hereby incorporated by reference.
4.6	Fourth Amendment to Second Amended and Restated Investor Rights Agreement, dated as of January 13, 2012, by and among Spirit Airlines, Inc., Indigo Florida, L.P., Indigo Miramar LLC, OCM Spirit Holdings, LLC, OCM Spirit Holdings II, LLC, OCM Spirit Holdings III, LLC, OCM Spirit Holdings III-A, LLC, OCM Principal Opportunities Fund II, L.P., OCM Principal Opportunities Fund III, L.P., POF Spirit Foreign Holdings, LLC, and certain other investors, filed as Exhibit 4.1 to the Company's Current Report on Form 8-K dated January 13, 2012, is hereby incorporated by reference.
10.1†	V2500 General Terms of Sale, dated as of March 1, 2005, between Spirit Airlines, Inc. and IAE International Aero Engines AG, as supplemented by Side Letter No. 1 dated as of March 1, 2005, Side Letter No. 2 dated as of March 1, 2005, Side Letter No. 3 dated as of March 1, 2005, Side Letter No. 4 dated as of March 1, 2005, and Side Letter No. 5 dated as of April 11, 2005, filed as Exhibit 10.1 to the Company's Amendment No. 4 to Form S-1 Registration Statement (No. 333-169474), is hereby incorporated by reference.
10.2†	Fleet Hour Agreement, dated as of April 11, 2005, between Spirit Airlines, Inc. and IAE International Aero Engines AG, as supplemented by Side Letter No. 1 dated as of April 11, 2005, Side Letter No. 2 dated June 6, 2006, Side Letter No. 3 dated June 6, 2006, Side Letter No. 4 dated June 6, 2006, Side Letter No. 5 dated February 4, 2009 (as amended by Amendment No. 1 to Side Letter No. 5 dated March 6, 2009), filed as Exhibit 10.2 to the Company's Amendment No. 4 to Form S-1 Registration Statement (No. 333-169474), is hereby incorporated by reference.
10.3†	Hosted Services Agreement, dated as of February 28, 2007, between Spirit Airlines, Inc. and Navitaire Inc., as amended by Amendment No. 1 dated as of October 23, 2007, Amendment No. 2 dated as of May 15, 2008, Amendment No. 3 dated as of November 21, 2008, Amendment No. 4 dated as of August 17, 2009 and Amendment No. 5 dated November 4, 2009, filed as Exhibit 10.3 to the Company's Amendment No. 4 to Form S-1 Registration Statement (No. 333-169474), is hereby incorporated by reference.

93

10.4†	Signatory Agreement, dated as of May 21, 2009, between Spirit Airlines, Inc. and U.S. Bank National Association, as amended by First Amendment dated January 18, 2010, filed as Exhibit 10.4 to the Company's Amendment No. 4 to Form S-1 Registration Statement (No. 333-169474), is hereby incorporated by reference.
10.5+	Offer Letter, dated August 11, 2005, between Spirit Airlines, Inc. and Tony Lefebvre, filed as Exhibit 10.5 to the Company's Amendment No. 3 to Form S-1 Registration Statement (No. 333-169474), is hereby incorporated by reference.
10.6†	Terms and Conditions for Worldwide Acceptance of the American Express Card by Airlines, dated September 4, 1998, between Spirit Airlines, Inc. and American Express Travel Related Services Company, Inc., as amended January 1, 2003 and August 28, 2003, filed as Exhibit 10.6 to the Company's Amendment No. 4 to Form S-1 Registration Statement (No. 333-169474), is hereby incorporated by reference.
10.7	Professional Services Agreement, dated as of July 13, 2006, between Spirit Airlines, Inc. and Indigo Partners LLC, filed as Exhibit 10.7 to the Company's Amendment No. 3 to Form S-1 Registration Statement (No. 333-169474), is hereby incorporated by reference.
10.8	Termination Agreement, dated as of June 1, 2011, by and between Spirit Airlines, Inc. and Indigo Partners LLC, filed as Exhibit 10.3 to the Company's Current Report on Form 8-K dated June 1, 2011, is hereby incorporated by reference.
10.9	Stockholders Voting Agreement, by and among Spirit Airlines, Inc., OCM Spirit Holdings, LLC, OCM Spirit Holdings II, LLC, OCM Spirit Holdings III, LLC, OCM Spirit Holdings III-A, LLC, OCM Principal Opportunities Fund II, L.P., OCM Principal Opportunities Fund III, L.P., POF Spirit Foreign Holdings, LLC, Indigo Florida L.P. and Indigo Miramar LLC, filed as Exhibit 10.9 to the Company's Form S-1 Registration Statement (No. 333-178336), is hereby incorporated by reference.
10. 10	Recapitalization Agreement, dated as of September 17, 2010, by and among Spirit Airlines, Inc., POF Spirit Foreign Holdings, LLC, OCM Spirit Holdings, LLC, OCM Spirit Holdings II, LLC, OCM Principal Opportunities Fund II, L.P., OCM Principal Opportunities Fund III, L.P., OCM Spirit Holdings III, LLC, OCM Spirit Holdings III-A, LLC, Highfields Capital I LP, Highfields Capital II LP; SAHC Holdings LLC, Indigo Florida L.P., Indigo Miramar LLC, Indigo Partners LLC, Jacob Schorr, Julianne B. Schorr, The David B. Schorr Trust U/T/A dated December 31, 1977, The Dina L. Schorr Trust U/T/A dated July 1, 1980, The Elliott A. Schorr Trust U/T/A dated December 31, 1977, The Raphael A. Schorr Trust U/T/A dated December 31, 1977, Taurus Investment Partners LLC, Selvin Passen, Nevada Spirit, LLC, and Mark Kahan, filed as Exhibit 10.11 to the Company's Form S-1 Registration Statement (No. 333-169474), is hereby incorporated by reference.
10.11	Amendment No. 1 to Recapitalization Agreement, dated as of May 25, 2011, by and among Spirit Airlines, Inc., POF Spirit Foreign Holdings, LLC, OCM Spirit Holdings, LLC, OCM Spirit Holdings II, LLC, OCM Principal Opportunities Fund II, L.P., OCM Principal Opportunities Fund III, L.P., OCM Spirit Holdings III, LLC, OCM Spirit Holdings III-A, LLC, Highfields Capital I LP, Highfields Capital II LP; SAHC Holdings LLC, Indigo Florida L.P., Indigo Miramar LLC, Indigo Partners LLC, Jacob Schorr, Julianne B. Schorr, The David B. Schorr Trust U/T/A dated December 31, 1977, The Dina L. Schorr Trust U/T/A dated July 1, 1980, The Elliott A. Schorr Trust U/T/A dated December 31, 1977, The Raphael A. Schorr Trust U/T/A dated December 31, 1977, Taurus Investment Partners LLC, Selvin Passen, Nevada Spirit, LLC, and Mark Kahan, filed as Exhibit 10.1 to the Company's Current Report on Form 8-K dated June 1, 2011, is hereby incorporated by reference.
10.12	Letter Agreement, dated as of December 12, 2008, made by Spirit Airlines, Inc. in favor of Indigo Pacific Partners L.P., Long Bar Miramar LLC, OCM Principal Opportunities Fund II, L.P., OCM Principal Opportunities Fund III, L.P., Highfields Capital I LP, Highfields Capital II LP, and SAHC Holdings LLC, filed as Exhibit 10.11 to the Company's Amendment No. 4 to Form S-1 Registration Statement (No. 333-169474), is hereby incorporated by reference.
10.13	Tax Receivable Agreement, dated as of June 1, 2011 between Spirit Airlines, Inc., Indigo Pacific Partners LLC, and OCM FIE, LLC, filed as Exhibit 10.12 to the Company's Form S-1 Registration Statement (No. 333-178336), is hereby incorporated by reference.
10.14†	Lease, dated as of June 17, 1999, between Sunbeam Development Corporation and Spirit Airlines, Inc., as amended by Lease Modification and Contraction Agreement dated as of May 7, 2009, filed as Exhibit 10.13 to the Company's Amendment No. 4 to Form S-1 Registration Statement (No. 333-169474), is hereby incorporated by reference.

94

10.15	Airline-Airport Lease and Use Agreement, dated as of August 17, 1999, between Broward County and Spirit Airlines, Inc., as supplemented by Addendum dated August 17, 1999, filed as Exhibit 10.14 to the Company's Amendment No. 3 to Form S-1 Registration Statement (No. 333-169474), is hereby incorporated by reference.
10.16†	Airbus A320 Family Purchase Agreement, dated as of May 5, 2004, between AVSA, S.A.R.L. and Spirit Airlines, Inc.; as amended by Amendment No. 1 dated as of December 21, 2004, Amendment No. 2 dated as of April 15, 2005, Amendment No. 3 dated as of June 30, 2005, Amendment No. 4 dated as of October 27, 2006 (as amended by Letter Agreement No. 1, dated as of October 27, 2006, to Amendment No. 4 and Letter Agreement No. 2, dated as of October 27, 2006, to Amendment No. 4), Amendment No. 5 dated as of March 5, 2007, Amendment No. 6 dated as of March 27, 2007, Amendment No. 7 dated as of June 26, 2007 (as amended by Letter Agreement No. 1, dated as of June 26, 2007, to Amendment No. 7), Amendment No. 8 dated as of February 4, 2008, Amendment No. 9 dated as of June 24, 2008 (as amended by Letter Agreement No. 1, dated as of June 24, 2008, to Amendment No. 9) and Amendment No. 10 dated July 17, 2009 (as amended by Letter Agreement No. 1, dated as of July 17, 2009, to Amendment No. 10); and as supplemented by Letter Agreement No. 1 dated as of May 5, 2004, Letter Agreement No. 2 dated as of May 5, 2004, Letter Agreement No. 3 dated as of May 5, 2004, Letter Agreement No. 4 dated as of May 5, 2004, Letter Agreement No. 5 dated as of May 5, 2004, Letter Agreement No. 6 dated as of May 5, 2004, Letter Agreement No. 7 dated as of May 5, 2004, Letter Agreement No. 8 dated as of May 5, 2004, Letter Agreement No. 9 dated as of May 5, 2004, Letter Agreement No. 10 dated as of May 5, 2004 and Letter Agreement No. 11 dated as of May 5, 2004, filed as Exhibit 10.15 to the Company's Amendment No. 4 to Form S-1 Registration Statement (No. 333-169474), is hereby incorporated by reference.
10.17+	Spirit Airlines, Inc. Executive Severance Plan, filed as Exhibit 10.16 to the Company's Amendment No. 3 to Form S-1 Registration Statement (No. 333-169474), is hereby incorporated by reference.
10.18+	Amended and Restated Spirit Airlines, Inc. 2005 Stock Incentive Plan and related documents, filed as Exhibit 10.17 to the Company's Amendment No. 3 to Form S-1 Registration Statement (No. 333-169474), is hereby incorporated by reference.
10.19+	Spirit Airlines, Inc. 2011 Equity Incentive Award Plan, filed as Exhibit 10.2 to the Company's Form S-8 Registration Statement (No. 333-174812), is hereby incorporated by reference.
10.20+	Employment Agreement, dated as of January 24, 2005, between Spirit Airlines, Inc. and B. Ben Baldanza, filed as Exhibit 10.19 to the Company's Amendment No. 3 to Form S-1 Registration Statement (No. 333-169474), is hereby incorporated by reference.
10.21+	Offer Letter, dated December 11, 2006, between Spirit Airlines, Inc. and David Lancelot, filed as Exhibit 10.20 to the Company's Amendment No. 3 to Form S-1 Registration Statement (No. 333-169474), is hereby incorporated by reference.
10.22+	Offer Letter, dated January 27, 2005, between Spirit Airlines, Inc. and Barry Biffle, filed as Exhibit 10.21 to the Company's Amendment No. 3 to Form S-1 Registration Statement (No. 333-169474), is hereby incorporated by reference.
10.23+	Offer Letter, dated September 10, 2007, between Spirit Airlines, Inc. and Thomas Canfield, filed as Exhibit 10.22 to the Company's Amendment No. 3 to Form S-1 Registration Statement (No. 333-169474), is hereby incorporated by reference.
10.24+	Offer Letter, dated November 21, 2009, between Spirit Airlines, Inc. and Kenneth McKenzie, filed as Exhibit 10.23 to the Company's Amendment No. 3 to Form S-1 Registration Statement (No. 333-169474), is hereby incorporated by reference.
10.25	Form of Indemnification Agreement between Spirit Airlines, Inc. and its directors and executive officers, filed as Exhibit 10.24 to the Company's Amendment No. 3 to Form S-1 Registration Statement (No. 333-169474), is hereby incorporated by reference.
10.26	Reimbursement Agreement, dated as of July 12, 2005, among Spirit Airlines, Inc., Spirit Aviation Services, LLC and Goldman Sachs Credit Partners, L.P., as amended by First Amendment dated July 13, 2006, Second Amendment dated December 12, 2008, Third Amendment dated May 21, 2009, Fourth Amendment dated September 30, 2010 and Fifth Amendment dated April 29, 2011, filed as Exhibit 10.25 to the Company's Amendment No. 7 to Form S-1 Registration Statement (No. 333-169474), is hereby incorporated by reference.
10.27	Form of Stock Option Grant Notice and Stock Option Agreement for Awards under the Spirit Airlines, Inc. 2011 Equity Incentive Award Plan, filed as Exhibit 10.3 to the Company's Form S-8 Registration Statement (No. 333-174812), is hereby incorporated by reference.

95

10.28	Form of Restricted Stock Unit Award Grant Notice and Restricted Stock Unit Award Agreement under the Spirit Airlines, Inc. 2011 Equity Incentive Award Plan, filed as Exhibit 10.4 to the Company's Form S-8 Registration Statement (No. 333-174812), is hereby incorporated by reference.
10.29†	Addendum and Amendment to the Agreement Governing Acceptance of the American Express Card by Airlines, dated as of June 24, 2011, by and between Spirit Airlines, Inc. and American Express Travel Related Services Company, Inc., filed as Exhibit 10.1 to the Company's Form 10-Q dated July 28, 2011, is hereby incorporated by reference.
10.30†	Second Amendment to Signatory Agreement, effective as of September 6, 2011, by and between the Company and U.S. Bank, National Association, filed as Exhibit 10.1 to the Company's Form 10-Q/A dated December 22, 2011, is hereby incorporated by reference.
10.31	Stock Distribution Agreement, dated December 7, 2011, by and among Spirit Airlines, Inc., Indigo Miramar LLC, Nilchii LLC, Mesa Air Group, Inc., Anchorage Illiquid Opportunities Offshore Master Fund, L.P., Anchorage Illiquid Opportunities Offshore Master Fund II, L.P. and Par Investment Partners, L.P., filed as Exhibit 10.32 to the Company's Amendment No.1 to Form S-1 Registration Statement (No. 333-178336), is hereby incorporated by reference.
10.32†	Amendment No. 11 dated as of December 29, 2011, to the Airbus A320 Family Purchase Agreement, dated as of May 5, 2004, by and between the Company and Airbus S.A.S. (legal successor to AVSA S.A.R.L.), as amended by Letter Agreement No. 1 dated as of December 29, 2011, Letter Agreement No. 2 dated as of December 29, 2011, Letter Agreement No. 3 dated as of December 29, 2011, Letter Agreement No. 4 dated as of December 29, 2011, Letter Agreement No. 5 dated as of December 29, 2011, Letter Agreement No. 6 dated as of December 29, 2011, Letter Agreement No. 7 dated as of December 29, 2011 and Letter Agreement No. 8 dated as of December 29, 2011, filed as Exhibit 10.1 to the Company's Form 8-K dated January 5, 2012, is hereby incorporated by reference.
10.33†	Side Letter No. 6 to the Fleet Hour Agreement, dated March 10, 2011 (as amended by Amendment No. 1 to Side Letter No. 6, effective as of January 31, 2012), by and between Spirit Airlines, Inc. and IAE International Aero Engines AG, filed as Exhibit 10.33 to the Company's Form 10-K dated February 23, 2012, is hereby incorporated by reference.
10.34	Separation Agreement, effective March 26, 2012, by and between Spirit Airlines, Inc. and David Lancelot, filed as Exhibit 10.1 to the Company's Form 10-Q dated May 1, 2012, is hereby incorporated by reference.
10.35	Letter Agreement, effective April 16, 2012, by and between Spirit Airlines, Inc. and Edward M. Christie, III, filed as Exhibit 10.2 to the Company's Form 10-Q dated May 1, 2012, is hereby incorporated by reference.
14.1	Code of Business Conduct and Ethics, filed as Exhibit 14.1 to the Company's Form S-1 Registration Statement (No. 333-178336), is hereby incorporated by reference.
21.1	List of subsidiaries.
23.1	Consent of Ernst & Young LLP, independent registered public accounting firm.
31.1	Certification of the Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2	Certification of the Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1**	Certifications pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS***	XBRL Instance Document.
101.SCH***	XBRL Taxonomy Extension Schema Document.
101.CAL***	XBRL Taxonomy Extension Calculation Linkbase Document.
101.DEF***	XBRL Taxonomy Extension Definition Linkbase Document.
101.LAB***	XBRL Taxonomy Extension Label Linkbase Document.
101.PRE***	XBRL Taxonomy Extension Presentation Linkbase Document.

96

†	Confidential treatment granted for certain portions of this Exhibit pursuant to Rule 406 under the Securities Act or Rule 24b-2 under the Exchange Act, which portions are omitted and filed separately with the Securities and Exchange Commission.
+	Indicates a management contract or compensatory plan or arrangement.
**	Exhibit 32.1 is being furnished and shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liability of that section, nor shall such exhibit be deemed to be incorporated by reference in any registration statement or other document filed under the Securities Act of 1933, as amended, or the Exchange Act, except as otherwise specifically stated in such filing.
***	XBRL (Extensible Business Reporting Language) information is furnished and not filed or a part of a registration statement or prospectus for purposes of Sections 11 or 12 of the Securities Act of 1933, as amended, is deemed not filed for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and is not otherwise subject to liability under these Sections.

97

EX-23.1

Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the following Registration Statements:

(1) Registration Statement (Form S-3 No. 333-182954) of Spirit Airlines, Inc. and the related Prospectus, and

(2) Registration Statement (Form S-8 No.333-174812) pertaining to the Amended and Restated 2005 Incentive Stock Plan and the 2011 Equity Incentive Award Plan of Spirit Airlines, Inc.;

of our reports dated February 25, 2013, with respect to the financial statements of Spirit Airlines, Inc. and the effectiveness of internal control over financial reporting of Spirit Airlines, Inc., included in this Annual Report (Form 10-K) for the year ended December 31, 2012.

/s/ Ernst & Young LLP

Certified Public Accountants

Miami, Florida

February 25, 2013

EX-31.1

Exhibit 31.1

CERTIFICATION

I, B. Ben Baldanza, President and Chief Executive Officer of Spirit Airlines, Inc., certify that:

1. I have reviewed this annual report on Form 10-K for the year ended December 31, 2012, of Spirit Airlines, Inc. (the "Registrant");

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the Registrant as of, and for, the periods presented in this report;

4. The Registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as described in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the Registrant and have:

a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the Registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of the Registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) disclosed in this report any change in the Registrant's internal control over financial reporting that occurred during the Registrant's most recent fiscal quarter (the Registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the Registrant's internal control over financial reporting; and

5. The Registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the Registrant's auditors and the audit committee of the Registrant's board of directors (or persons performing the equivalent functions):

a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the Registrant's ability to record, process, summarize and report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the Registrant's internal control over financial reporting.

Date: February 25, 2013	/s/ B. Ben Baldanza
	B. Ben Baldanza
	President and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION

I, Edward Christie, Senior Vice President and Chief Financial Officer of Spirit Airlines, Inc., certify that:

1. I have reviewed this annual report on Form 10-K for the year ended December 31, 2012, of Spirit Airlines, Inc. (the "Registrant");

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the Registrant as of, and for, the periods presented in this report;

4. The Registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as described in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the Registrant and have:

a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the Registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of the Registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) disclosed in this report any change in the Registrant's internal control over financial reporting that occurred during the Company’s most recent fiscal quarter (the Registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the Registrant's internal control over financial reporting; and

5. The Registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the Registrant's auditors and the audit committee of the Registrant's board of directors (or persons performing the equivalent functions):

a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the Registrant's ability to record, process, summarize and report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the Registrant's internal control over financial reporting.

Date: February 25, 2013	/s/ Edward M. Christie
	Edward M. Christie
	Senior Vice President and
	Chief Financial Officer

EX-32.1

Exhibit 32.1

Certifications Pursuant to 18 U.S.C. § 1350 As Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

Pursuant to 18 U.S.C. § 1350, adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, each undersigned officer of Spirit Airlines, Inc. (the “Company”) hereby certifies, to such officer’s knowledge, that:

(i.) the Annual Report on Form 10-K of the Company for the year ended December 31, 2012 (the "Report") fully complies with the requirements of Section 13(a) or Section 15(d), as applicable, of the Securities Exchange Act of 1934, as amended; and

(ii.) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: February 25, 2013	/s/ B. Ben Baldanza
	B. Ben Baldanza
	President and Chief Executive Officer
Date: February 25, 2013	/s/ Edward M. Christie
	Edward M. Christie
	Senior Vice President and
	Chief Financial Officer

XML

Summary of Significant Accounting Policies - Frequent Flier Program (Details) (USD $) In Millions, unless otherwise specified				12 Months Ended	3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2012 Transportation Component	Mar. 31, 2011 Marketing Component	Dec. 31, 2010 Marketing Component
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Affinity Card Program, deferred fair value of the transportation component, recognition period				16 months
Affinity Card Program, administrator agreement, expiration settlement, amount						$ 5.0
Affinity Card Program, administrator agreement, expiration settlement, gain recognized					0.4	4.6
Affinity Card Program, co-branded Spirit credit card, contract term			5 years
Liability for future FREE SPIRIT award redemptions and unrecognized revenue from the sale of mileage credits	$ 2.4	$ 3.7

XML

Debt, Related-Party Transactions and Other Obligations - Debt (Narrative) (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Line of Credit Facility [Line Items]
Debt outstanding	$ 0	$ 0
Due to related parties, current	0	0
Line of credit | Corporate credit cards
Line of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity	18,600,000	8,600,000
Line of credit, amount outstanding	3,200,000	2,400,000
Line of credit | Aircraft fuel
Line of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity	18,000,000
Line of credit | Jet fuel derivatives
Line of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity	5,000,000	8,000,000
Line of credit, amount outstanding	0	0
Line of credit | Jet fuel delivery
Line of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity	10,000,000
Line of credit, amount outstanding	11,200,000
Line of credit | Jet fuel derivatives and/or delivery
Line of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity	3,000,000
Line of credit, amount outstanding	$ 0

XML

Stock-Based Compensation - Share Option Activity (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Total fair value of shares vested	$ 400,000	$ 300,000	$ 200,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning of period (in shares)	312,000
Exercised (in shares)	(57,725)		0
Forfeited or expired (in shares)	(6,625)
Outstanding, end of period (in shares)	247,650	312,000
Exercisable (in shares)	70,900
Vested or Expected to Vest (in shares)	238,932
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding, weighted-average exercise price, beginning of period (in dollars per share)	$ 9.33
Exercised, weighted-average exercise price (in dollars per share)	$ 8.16
Forfeited or expired, weighted-average exercise price (in dollars per share)	$ 9.74
Outstanding, weighted-average exercise price, end of period (in dollars per share)	$ 9.59	$ 9.33
Exercisable, weighted-average exercise price (in dollars per share)	$ 9.29
Vested or Expected to Vest, weighted-average exercise price (in dollars per share)	$ 9.56
Outstanding, average remaining contractual term	8 years	8 years 10 months 24 days
Exercisable, average remaining contractual term	7 years 10 months 24 days
Vested or Expected to Vest, average remaining contractual term	8 years
Outstanding, aggregate intrinsic value	2,015,000	1,946,000
Exercisable, aggregate intrinsic value	598,000
Vested or expected to vest, aggregate intrinsic value	1,951,000
Granted (in shares)	0
Granted, weighted-average exercise price (in dollars per share)		$ 5.73	$ 4.06
Total intrinsic value of share options exercised	$ 700,000	$ 200,000

XML

Operating Segments and Related Disclosures (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting [Abstract]
DOT—domestic									$ 1,135,100,000	$ 900,100,000	$ 625,000,000
DOT—Latin America									183,300,000	171,100,000	156,300,000
Total operating revenue	$ 328,268,000	$ 342,317,000	$ 346,308,000	$ 301,495,000	$ 273,919,000	$ 288,714,000	$ 275,891,000	$ 232,662,000	$ 1,318,388,000	$ 1,071,186,000	$ 781,265,000
Foreign country | Total passenger revenue | Maximum
Concentration Risk [Line Items]
Concentration of risk, benchmark for revenue generated from one foreign country as a percentage of total passenger revenue, maximum									4.00%	4.00%	4.00%

XML

Debt, Related-Party Transactions and Other Obligations - Related Party (Narrative) (Details) (Principal Stockholders, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Principal Stockholders
Related Party Transaction [Line Items]
Management fee paid to principal stockholders for certain consulting services provided	$ 0	$ 0.3	$ 0.8

XML

Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Payables and Accruals [Abstract]
Federal excise and other passenger taxes and fees payable	$ 23,401	$ 17,813
Aircraft maintenance	22,319	7,816
Salaries and wages	21,057	17,123
Airport expenses	16,024	10,682
Fuel	11,219	87
Aircraft and facility rent	8,020	7,206
Current portion of tax receivable agreement	7,987	27,399
Other	11,287	10,730
Accrued liabilities	$ 121,314	$ 98,856

XML

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2012

Income Tax Disclosure [Abstract]

Significant components of the provision for income taxes from continuing operations

Significant components of the provision for income taxes from continuing operations are as follows:

	For the Years Ended December 31,
	2012		2011		2010
	(in thousands)
Current:
Federal	$	32,656	$	1,866	$	258
State and local	3,250		74		68
Foreign	963		263		189
Total current expense	36,869		2,203		515
Deferred:
Federal	27,870		42,148		(48,934		)
State and local	1,385		2,032		(3,877		)
Total deferred expense (benefit)	29,255		44,180		(52,811		)
Total income tax expense (benefit)	$	66,124	$	46,383	$	(52,296	)

Reconciliation of income tax expense

The reconciliation of income tax expense computed at the federal statutory tax rates to income tax expense from continuing operations is as follows:

	For the Years Ended December 31,
	2012			2011			2010
	(in thousands)
Expected provision at federal statutory tax rate	$	61,104		$	42,991		$	7,062
State and foreign tax expense, net of federal benefit	3,726			2,255			413
Interest and dividend on preferred stock	—			710			1,612
Change in valuation allowance	—			—			(65,248		)
Meals and entertainment	649			469			315
Fines and penalties	84			(36		)	9
Federal credits	—			(103		)	(156		)
Adjustment to deferred tax assets and liabilities	(3		)	(3		)	3,486
Other	564			100			211
Total income tax expense (benefit)	$	66,124		$	46,383		$	(52,296	)

Deferred taxes

At December 31, 2012 and 2011, the significant components of the Company's deferred taxes consisted of the following:

	December 31,
	2012			2011
	(in thousands)
Deferred tax assets:
Net operating loss	$	83		$	6,234
Deferred loss	—			1,440
Deferred revenue	5,829			5,985
Federal tax credits	—			3,176
Nondeductible accruals	6,744			5,452
Other	1,072			306
Gross deferred tax assets	13,728			22,593
Deferred tax assets, net	13,728			22,593
Deferred tax liabilities:
Capitalized interest	(1,125		)	(2,041		)
Deferred gain	(364		)	—
Fuel hedging	(97		)	(115		)
Accrued engine maintenance	(29,497		)	(10,232		)
Property, plant, and equipment	(3,271		)	(1,575		)
Gross deferred tax liabilities	(34,354		)	(13,963		)
Net deferred tax assets (liabilities)	$	(20,626	)	$	8,630
Deferred taxes included within:
Assets:
Other current assets	$	12,591		$	20,738
Liabilities:
Other long-term liabilities	(33,216		)	(12,108		)

XML

Leases and Prepaid Maintenance Deposits - Fixed Maintenance Reserve Payments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Leases And Prepaid Maintenance Deposits [Abstract]
Estimated fixed maintenance reserve payments, 2013	$ 10.3
Estimated fixed maintenance reserve payments, 2014	10.6
Estimated fixed maintenance reserve payments, 2015	11.0
Estimated fixed maintenance reserve payments, 2016	11.4
Estimated fixed maintenance reserve payments, 2017	11.1
Estimated fixed maintenance reserve payments, 2018 and beyond	$ 40.4

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Initial Public Offering and Tax Receivable Agreement (Details) (USD $)	0 Months Ended	3 Months Ended	12 Months Ended
	Jun. 02, 2011 debtors	Jun. 30, 2012	Dec. 31, 2011	Dec. 31, 2012
Initial Public Offering and Tax Receivable Agreement [Abstract]
Proceeds from initial public offering	$ 187,200,000
Common stock price at IPO (in dollars per share)	$ 12
Proceeds from IPO, after underwriter commissions	176,900,000
Proceeds from IPO, after paying debt and direct issuance costs	150,000,000
Debts paid from IPO proceeds	20,600,000
Number of unaffiliated debt holders paid with IPO proceeds (in debtors)	3
Direct IPO costs	5,900,000
Debt exchanged for common stock	279,200,000
Unpaid dividends exchanged for common stock	81,700,000
Common shares exchanged for forgiveness of debt and unpaid dividends (in shares)	30,079,420
Interest expense reduction from IPO transactions	400,000
Percentage of cash savings from pre-IPO NOLs due to pre-IPO stockholders			90.00%
Cash payment including interest to pre-IPO stockholders pursuant to tax receivable agreement		27,200,000
Interest included in cash payment to pre-IPO stockholders pursuant to tax receivable agreement		300,000
Estimated remaining cash payment to pre-IPO stockholders			27,399,000	7,987,000
Class B Common Stock
Initial Public Offering [Line Items]
Conversion ratio for class B common stock to common stock (in shares)	1
Initial Public Offering
Initial Public Offering [Line Items]
Shares issued in public offering (in shares)	15,600,000
Incurred costs			2,250,000
Initial Public Offering | Repayments to Unaffiliated Debt Holders
Initial Public Offering [Line Items]
Incurred costs	$ 500,000

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Quarterly Financial Data (Unaudited)

12 Months Ended

Dec. 31, 2012

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Data (Unaudited)

Quarterly Financial Data (Unaudited)

Quarterly results of operations for the year ended December 31, 2012 are summarized below:

	Three Months Ended
	March 31		June 30		September 30		December 31
	(in thousands, except per share amounts)
2012
Operating revenue	$	301,495	$	346,308	$	342,317	$	328,268
Operating income	37,244		55,132		49,681		31,933
Net income	23,419		34,591		30,884		19,566
Basic earnings per share	0.32		0.48		0.43		0.27
Diluted earnings per share	0.32		0.48		0.43		0.27
2011
Operating revenue	$	232,662	$	275,891	$	288,714	$	273,919
Operating income	26,844		34,959		44,556		38,023
Net income	7,883		16,917		27,657		23,991
Basic earnings per share	0.30		0.41		0.38		0.33
Diluted earnings per share	0.30		0.41		0.38		0.33

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Stock-Based Compensation - Simulation Model Input Variables (Details) (Performance Share Awards)	12 Months Ended
	Dec. 31, 2012
Performance Share Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average assumptions, expected volatility factor	39.00%
Weighted average assumptions, risk-free interest rate	0.44%
Weighted average assumptions, expected term	2 years 8 months 19 days
Weighted average assumptions, expected dividend yield	0.00%

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Summary of Significant Accounting Policies - Maintenance Costs (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Aircraft Maintenance, Materials, and Repairs [Line Items]
Total maintenance expense	$ 49,460	$ 34,017	$ 27,035
Flight hour-based maintenance expense
Aircraft Maintenance, Materials, and Repairs [Line Items]
Total maintenance expense	25,748	21,974	16,683
Non-flight hour-based maintenance expense
Aircraft Maintenance, Materials, and Repairs [Line Items]
Total maintenance expense	$ 23,712	$ 12,043	$ 10,352

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Summary of Significant Accounting Policies - Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Accounting Policies [Abstract]
Deferred offering costs charged to additional paid-in capital, net of proceeds		$ 6,100,000
Credit shell, contractual term	60 days
Amortization of heavy maintenance and major overhaul costs	9,100,000	2,574,000	1,307,000
Deferred costs for heavy maintenance	61,600,000	22,100,000	5,200,000
Accumulated heavy maintenance amortization	(14,000,000)	(4,900,000)	(2,300,000)
Marketing and advertising expenses	2,400,000	2,500,000	4,000,000
Related-party interest expense	0	21,000,000	44,600,000
Non-related party interest expense	$ 1,400,000	$ 3,800,000	$ 5,700,000
Aircraft fuel expenditure concentration risk | Total operating expenses
Concentration Risk [Line Items]
Company's employees covered under collective bargaining agreements (as a percent)	41.00%	42.00%	35.00%
Unionized employees concentration risk | Number of employees, total
Concentration Risk [Line Items]
Union-represented employee groups	3
Company's employees covered under collective bargaining agreements (as a percent)	54.00%	52.00%

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Stock-Based Compensation - Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Restricted Stock and Restricted Stock Units	Dec. 31, 2011 Restricted Stock and Restricted Stock Units	Dec. 31, 2012 Stock Options	Dec. 31, 2011 Stock Options	Dec. 31, 2010 Stock Options	Dec. 31, 2012 Performance Share Awards	Dec. 31, 2007 2005 Stock Plan	Dec. 31, 2012 2011 Equity Incentive Award Plan	Dec. 31, 2011 2011 Equity Incentive Award Plan	May 09, 2011 2011 Equity Incentive Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issue (in shares)										2,500,000			3,000,000
Shares available for future issuance (in shares)											2,689,490	3,336,614
Award vesting percentage, per year (as a percent)				25.00%
Award vesting period						4 years
Contractual term						10 years
Weighted average assumptions, expected volatility factor							46.25%	51.60%	39.00%
Weighted average assumptions, expected dividend yield							0.00%	0.00%	0.00%
Weighted average assumptions, expected term							6 years 3 months	6 years 3 months	2 years 8 months 19 days
Weighted average assumptions, risk-free interest rate							2.03%	2.12%	0.44%
Share-based compensation cost	$ 4,327,000	$ 530,000	$ 569,000
Share-based compensation cost, tax benefit recognized in income	1,600,000	189,000	400,000
Total unrecognized compensation cost				$ 6,800,000	$ 1,300,000				$ 6,900,000
Total unrecognized cost, period for recognition (in years)				3 years 1 month 6 days	2 years 7 months 6 days				2 years
Potential vesting percentage, minimum									0.00%
Potential vesting percentage, minimum									200.00%
Issuance window after award vesting									60 days

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Commitments and Contingencies - Employees (Details) (USD $) In Millions, unless otherwise specified				12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Number of employees, total Unionized employees concentration risk	Dec. 31, 2011 Number of employees, total Unionized employees concentration risk	Dec. 31, 2012 Number of employees, total Unionized employees concentration risk Air Line Pilots Association, International	Dec. 31, 2012 Number of employees, total Unionized employees concentration risk Association of Flight Attendants	Dec. 31, 2012 Number of employees, total Unionized employees concentration risk Transport Workers Union
Concentration Risk [Line Items]
Company's employees covered under collective bargaining agreements (as a percent)				54.00%	52.00%	22.00%	31.00%	1.00%
Accrued Health Care Claims	$ 1.9	$ 2.0	$ 2.1

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Defined Contribution 401(k) Plan (Details) (USD $)	12 Months Ended
	Dec. 31, 2012 defined_contribution_plan	Dec. 31, 2011	Dec. 31, 2010
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Defined contribution 401(k) plan, number of plans	3
Defined contribution 401(k) plan, matching contributions made in period	$ 6,600,000	$ 4,900,000	$ 4,800,000
Spirit Airlines, Inc. Employee Retirement Savings Plan
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Defined contribution 401(k) plan, requisite service period	60 days
Defined contribution 401(k) plan, requisite service period, hours	1000 hours
Defined contribution 401(k) plan, requisite age	21 years
Defined contribution plan, employer matching contribution, percent of match	50.00%
Spirit Airlines, Inc. Pilots’ Retirement Savings Plan
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Defined contribution 401(k) plan, requisite service period	60 days
Defined contribution 401(k) plan, requisite service period, hours	1000 hours
Defined contribution 401(k) plan, requisite age	21 years
Defined contribution plan, employer matching contribution, percent of match	100.00%
Defined contribution 401(k) plan, IRS elective deferral limit	17,000
Spirit Airlines, Inc. Puerto Rico Retirement Savings Plan
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Defined contribution 401(k) plan, requisite service period	60 days
Defined contribution 401(k) plan, requisite service period, hours	1000 hours
Defined contribution 401(k) plan, requisite age	21 years
Defined contribution 401(k) plan, IRS elective deferral limit	$ 13,000
Maximum | Spirit Airlines, Inc. Employee Retirement Savings Plan
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Defined contribution 401(k) plan, maximum employer contribution percent of the employee’s annual compensation	3.00%
Maximum | Spirit Airlines, Inc. Pilots’ Retirement Savings Plan
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Defined contribution 401(k) plan, maximum employer contribution percent of the employee’s annual compensation	8.00%
Pilots | Spirit Airlines, Inc. Puerto Rico Retirement Savings Plan
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Defined contribution plan, employer matching contribution, percent of match	100.00%
Pilots | Maximum | Spirit Airlines, Inc. Puerto Rico Retirement Savings Plan
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Defined contribution 401(k) plan, maximum employer contribution percent of the employee’s annual compensation	8.00%
Other Employees | Spirit Airlines, Inc. Puerto Rico Retirement Savings Plan
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Defined contribution plan, employer matching contribution, percent of match	50.00%
Other Employees | Maximum | Spirit Airlines, Inc. Puerto Rico Retirement Savings Plan
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Defined contribution 401(k) plan, maximum employer contribution percent of the employee’s annual compensation	3.00%

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Common Stock and Preferred Stock (Details) (USD $)				0 Months Ended
	Dec. 31, 2012	Dec. 31, 2012 Common Stock	Dec. 31, 2011 Common Stock	Dec. 07, 2011 Non-Voting Common Stock	Dec. 31, 2012 Non-Voting Common Stock	Dec. 31, 2011 Non-Voting Common Stock	May 31, 2011 Class A Peferred Sock	May 31, 2011 Class B Preferred Stock	May 31, 2011 Class A Common Stock	Jun. 02, 2011 Class B Common Stock	May 31, 2011 Class B Common Stock
Class of Stock [Line Items]
Common stock, shares authorized		240,000,000	240,000,000		50,000,000	50,000,000
Common stock, par value per share		$ 0.0001	$ 0.0001		$ 0.0001	$ 0.0001
Preferred stock, shares authorized	10,000,000
Preferred sock, par value per share	$ 0.0001
Stock distribution agreement, common stock were exchanged on a share-for-share basis for shares of non-voting common stock				10,576,180
Preferred stock, shares issued							100,000	2,850
Preferred stock, shares outstanding							100,000	2,850
Common stock, shares issued		70,861,822	61,954,576		1,669,205	10,576,180			20,848,847		5,964,489
Common stock, shares outstanding		70,801,782	61,946,361		1,669,205	10,576,180			20,848,847		5,964,489
Conversion ratio for class B common stock to common stock (in shares)										1

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Special Charges and Credits

12 Months Ended

Dec. 31, 2012

Restructuring and Related Activities [Abstract]

Special Charges and Credits

Special Charges and Credits

Slot Transaction

In June 2012, the Company transferred four permanent air carrier slots at Ronald Reagan National Airport (“DCA”) to another airline ("buyer") for $9.1 million in cash, which the Company received in June. Due to FAA regulations, the buyer could not operate the slots until written confirmation of the slot transfer had been received from the FAA. In accordance with FAA's 80% “use or lose” requirements, the Company continued to operate all four slots through September 6, 2012. Due to the restriction preventing operating use of the slots by buyer, the gain of $9.1 million was fully deferred at the time of the sale. The Company recognized the $9.1 million gain within special charges (credits) in the third quarter of 2012, the period in which the FAA operating restriction lapsed and written confirmation of the slot transfer was received by the buyer from the FAA. 

Secondary Offering Costs

On July 31, 2012, certain existing stockholders affiliated with Oaktree Capital Management ("Oaktree") sold an aggregate of 9,394,927 shares of common stock in an underwritten public offering. The Company incurred a total of $0.7 million in costs during the year ended December 31, 2012, related to this offering. Upon completion of this offering, investment funds affiliated with Oaktree owned no shares of common stock of Spirit Airlines. The Company did not receive any proceeds from this offering.

Previously, on January 25, 2012, certain stockholders of the Company, including affiliates of Oaktree and Indigo Partners, LLC ("Indigo") and certain members of the Company's executive team, sold an aggregate of 12,650,000 shares of common stock in an underwritten public offering. The Company incurred a total of $1.3 million in costs between 2011 and 2012 related to this offering, of which $0.5 million were incurred during the year ended December 31, 2012, offset by reimbursements from certain selling shareholders of $0.6 million in accordance with the Fourth Amendment to the Second Amended and Restated Investor Rights Agreement. The Company did not receive any proceeds from this offering.

Initial Public Offering Costs

In June 2011, the Company issued and sold 15,600,000 shares of common stock in its initial public offering (IPO). The Company incurred contract termination costs and fees of $2.25 million in connection with the IPO during the year ended December 31, 2011, which included $1.8 million paid to Indigo to terminate its professional services agreement with the Company and $0.5 million paid to three individual, unaffiliated holders of the Company’s subordinated notes.

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Income Taxes - Components of the Provision for Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current:
Federal	$ 32,656	$ 1,866	$ 258
State and local	3,250	74	68
Foreign	963	263	189
Total current expense	36,869	2,203	515
Deferred:
Federal	27,870	42,148	(48,934)
State and local	1,385	2,032	(3,877)
Total deferred expense (benefit)	29,255	44,180	(52,811)
Total income tax expense (benefit)	$ 66,124	$ 46,383	$ (52,296)

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Special Charges and Credits (Details) (USD $)	0 Months Ended	12 Months Ended			1 Months Ended	3 Months Ended	12 Months Ended		12 Months Ended	24 Months Ended		0 Months Ended	12 Months Ended		0 Months Ended
	Jun. 02, 2011 debtors	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Jun. 30, 2012 Slot Transaction aircraft_slot	Sep. 30, 2012 Slot Transaction	Dec. 31, 2012 July 31, 2012 Secondary Offering	Jul. 31, 2012 July 31, 2012 Secondary Offering	Dec. 31, 2012 January 25, 2012 Secondary Offering	Dec. 31, 2012 January 25, 2012 Secondary Offering	Jan. 25, 2012 January 25, 2012 Secondary Offering	Jun. 02, 2011 Initial Public Offering	Dec. 31, 2011 Initial Public Offering	Dec. 31, 2011 Initial Public Offering Indigo Partners, LLC Professional Services Agreement Termination	Jun. 02, 2011 Initial Public Offering Repayments to Unaffiliated Debt Holders
Restructuring Cost and Reserve [Line Items]
Number of permanent air carrier slots transferred					4
Proceeds from sale of slots		$ 9,060,000	$ 0	$ 0	$ 9,100,000
Deferred gain on sale of slots					9,100,000
Gain recognized on sale of slots		9,060,000	0	0		9,100,000
Shares sold by certain stockholders in secondary offering (in shares)								9,394,927			12,650,000
Payments of stock issuance costs							700,000		500,000	1,300,000
Common stock, shares held, by Oaktree Capital Management, post secondary offering								0
Reimbursement of stock issuance costs									600,000
Shares issued in public offering (in shares)												15,600,000
Incurred costs													$ 2,250,000	$ 1,800,000	$ 500,000
Number of unaffiliated debt holders paid with IPO proceeds (in debtors)	3

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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2012

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of share option activity

A summary of share option activity under the 2011 Plan as of December 31, 2012 and changes during the year endedDecember 31, 2012 is presented below:

	Number of Shares		Weighted- Average Exercise Price ($)	Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value ($000)
Outstanding at December 31, 2011	312,000		9.33	8.9	1,946
Exercised	(57,725	)	8.16
Forfeited or expired	(6,625	)	9.74
Outstanding at December 31, 2012	247,650		9.59	8.0	2,015
Exercisable at December 31, 2012	70,900		9.29	7.9	598
Vested or Expected to Vest at December 31, 2012	238,932		9.56	8.0	1,951

Summary of the status of the Company's restricted stock shares

A summary of the status of the Company’s restricted stock shares (restricted stock awards and restricted stock unit awards) as of December 31, 2012 and changes during the year endedDecember 31, 2012 is presented below:

	Number of Shares		Weighted-Average Grant Date Fair Value ($)
Outstanding at December 31, 2011	271,999		1.43
Granted	391,418		20.01
Vested	(197,613	)	2.67
Forfeited	(16,175	)	4.79
Outstanding at December 31, 2012	449,629		16.94

Multiple input variables of performance share awards

The grant date fair value of the performance share awards was determined through the use of a Monte Carlo simulation model, which utilizes multiple input variables that determine the probability of satisfying the market condition requirements applicable to each award as follows:

	Weighted-Average at Grant Date
Expected volatility factor	0.39
Risk free interest rate	0.44	%
Expected term (in years)	2.72
Expected dividend yield	—	%

Performance share award activity

The following table summarizes the Company’s performance share awards for the year endedDecember 31, 2012:

	Number of Awards	Weighted-Average Fair Value at Grant Date ($)
Outstanding at December 31, 2011	—	—
Granted	280,907	20.30
Vested	—	—
Forfeited	—	—
Outstanding at December 31, 2012	280,907	20.30

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Accrued Liabilities (Tables)

12 Months Ended

Dec. 31, 2012

Payables and Accruals [Abstract]

Accrued liabilities included in other current liabilities

Accrued liabilities included in other current liabilities as of December 31, 2012 and 2011 consist of the following:

	As of December 31,
	2012		2011
	(in thousands)
Federal excise and other passenger taxes and fees payable	$	23,401	$	17,813
Aircraft maintenance	22,319		7,816
Salaries and wages	21,057		17,123
Airport expenses	16,024		10,682
Fuel	11,219		87
Aircraft and facility rent	8,020		7,206
Current portion of tax receivable agreement	7,987		27,399
Other	11,287		10,730
Accrued liabilities	$	121,314	$	98,856

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Leases and Prepaid Maintenance Deposits - Operating Leases (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012 aircraft_engine	Dec. 31, 2011	Dec. 31, 2010
Operating Leased Assets [Line Items]
Total rental expense	$ 172,400,000	$ 139,100,000	$ 122,700,000
Rental expense charged to operations for aircraft and engine operating leases	143,572,000	116,485,000	101,345,000
Prepaid aircraft maintenance to lessors, total	198,500,000	168,800,000
Supplemental rent	2,000,000	1,500,000	0
Number of spare aircraft engines entered into sale and leaseback agreement	2
Other current assets
Operating Leased Assets [Line Items]
Prepaid aircraft maintenance to lessors, current	$ 76,100,000	$ 48,200,000
Aircraft
Operating Leased Assets [Line Items]
Number of aircraft and spare engines financed under operating leases	45
Number of aircraft and spare engines financed under operating leases with a variable rate	5
Basis for aircraft financed under operating leases with a variable rate	LIBOR
Number of aircraft leaes available for renewal	17
Aircraft operating leases, renewal term	3 years
Aircraft operating leases, period before renewal	10 years
Aircraft | Minimum
Operating Leased Assets [Line Items]
Operating leases, term	3 years
Aircraft | Maximum
Operating Leased Assets [Line Items]
Operating leases, term	12 years
Other leased equipment and property | Maximum
Operating Leased Assets [Line Items]
Operating leases, term	20 years
Spare engines
Operating Leased Assets [Line Items]
Number of aircraft and spare engines financed under operating leases	8
Spare engines | Minimum
Operating Leased Assets [Line Items]
Operating leases, term	7 years
Spare engines | Maximum
Operating Leased Assets [Line Items]
Operating leases, term	12 years

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Letters of Credit (Details) (Standby letter of credit facility, USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Standby letter of credit facility
Line of Credit Facility [Line Items]
Posted letters of credit	$ 0.2	$ 0.2
Unsecured standby letter of credit facility, maximum borrowing capacity	10.0
Unsecured standby letter of credit facility, amount outstanding	$ 7.0

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Net Income per Share (Tables)

12 Months Ended

Dec. 31, 2012

Earnings Per Share [Abstract]

Computation of basic and diluted earnings per common share

The following table sets forth the computation of basic and diluted earnings per common share:

	Year Ended December 31,
	2012		2011		2010
	(in thousands, except for share and per share amounts)
Numerator
Net income	$	108,460	$	76,448	$	72,481
Denominator
Weighted-average shares outstanding, basic	72,386		53,241		26,184
Effect of dilutive stock awards	205		274		506
Adjusted weighted-average shares outstanding, diluted	72,591		53,515		26,690
Net Income per Share
Basic earnings per common share	$	1.50	$	1.44	$	2.77
Diluted earnings per common share	$	1.49	$	1.43	$	2.72

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Leases and Prepaid Maintenance Deposits (Tables)

12 Months Ended

Dec. 31, 2012

Leases And Prepaid Maintenance Deposits [Abstract]

Future minimum lease payments under noncancelable operating leases

Future minimum lease payments under noncancelable operating leases with initial or remaining terms in excess of one year at December 31, 2012 were as follows:

	Operating Leases
As of December 31,	Aircraft and Spare Engine Leases		Property Facility Leases		Total Operating Leases
	(in thousands)
2013	$	152,558	$	15,799	$	168,357
2014	152,575		13,964		166,539
2015	152,961		11,958		164,919
2016	152,801		7,553		160,354
2017	131,849		3,779		135,628
2018 and thereafter	358,310		20,717		379,027
Total minimum lease payments	$	1,101,054	$	73,770	$	1,174,824

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Recent Accounting Developments

12 Months Ended

Dec. 31, 2012

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

Recent Accounting Developments

Recent Accounting Developments

In May 2011, the FASB issued Accounting Standards Update No. 2011-04, Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and International Financial Reporting Standards (Topic 820)—Fair Value Measurement (ASU 2011-04). This ASU provides a consistent definition of fair value and ensures the fair value measurement and disclosure requirements are similar between GAAP and International Financial Reporting Standards. ASU 2011-04 changes certain fair value measurement principles and enhances the disclosure requirements particularly for Level 3 fair value measurements. ASU 2011-04 requires public and non-public companies to disclose the unobservable inputs that are significant to the fair value measurement. Public companies are now required to quantitatively disclose the unobservable inputs used in their Level 3 measurements. ASU 2011-04 provides examples of information companies might provide to comply with the disclosure requirements. The requirements include: (1) a description of the group responsible for valuation policies and procedures, to whom the group reports and the types of internal reporting procedures in place (e.g., interaction between the group and risk management or the audit committee to assess fair value measurements); (2) a description of the frequency and methods for calibration, back testing and other testing procedures used to evaluate pricing models; (3) a description of the process for analyzing changes in fair value measurements from period to period; (4) a description of the methods used to evaluate pricing information provided by third-party brokers or pricing services; (5) a description of the methods used to develop and substantiate the unobservable inputs used in a fair value measurement; and (6) a narrative description of the sensitivity of recurring Level 3 fair value measurements to changes in the unobservable inputs used, if changing those inputs would significantly affect the fair value measurement. On January 1, 2012, the Company adopted ASU 2011-04.

The adoption of ASU 2011-04 resulted in qualitative presentation changes to the Company's disclosures related to fair value measurements as disclosed in Note 8. These changes were primarily additional language regarding the Company's valuation policies and procedures including the frequency of valuation and testing of valuation models as well as the sensitivity of the Company's model to changes in unobservable inputs.

In December 2011, the FASB issued amendments to Accounting Standards Update No. 2011-11, Balance Sheet (Topic 210); Disclosures about Offsetting Assets and Liabilities (ASU 2011-11). The amendments in this update are designed to enhance disclosures by requiring improved information about financial instruments and derivative instruments that are either (a) offset in accordance with certain right to set-off conditions prescribed by current accounting guidance or (b) subject to an enforceable master netting arrangement or similar agreement, irrespective of whether they are offset in accordance with current accounting guidance. The amendments to ASU 2011-11 will be effective for the first interim or annual period beginning on or after January 1, 2013. Management does not expect the adoption of ASU 2011-11 to have a material impact on its financial statements.

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Financial Instruments and Risk Management (Tables)

12 Months Ended

Dec. 31, 2012

Investments, All Other Investments [Abstract]

Components of aircraft fuel expense

The following table summarizes the components of aircraft fuel expense for the years ended December 31, 2012, 2011 and 2010:

	Year Ended December 31,
	2012		2011			2010
	(in thousands)
Into-plane fuel cost	$	471,542	$	392,278		$	251,754
Settlement losses (gains)	175		(7,436		)	(1,483		)
Unrealized mark-to-market losses (gains)	46		3,204			(2,065		)
Aircraft fuel	$	471,763	$	388,046		$	248,206

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Summary of Significant Accounting Policies - Cash Proceeds Received from the Sale of Mileage Credits (Details) (Marketing Component, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Marketing Component
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Cash proceeds from sale of miles to non-airline third parties	$ 24,938	$ 20,954	$ 20,748
Portion of proceeds recognized immediately as marketing component	$ 20,998	$ 16,580	$ 10,576

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Net Income per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Numerator
Net income	$ 19,566	$ 30,884	$ 34,591	$ 23,419	$ 23,991	$ 27,657	$ 16,917	$ 7,883	$ 108,460	$ 76,448	$ 72,481
Denominator
Weighted-average shares outstanding, basic									72,386	53,241	26,184
Effect of dilutive stock awards									205	274	506
Adjusted weighted-average shares outstanding, diluted									72,591	53,515	26,690
Net Income per Share
Basic earnings per common share	$ 0.27	$ 0.43	$ 0.48	$ 0.32	$ 0.33	$ 0.38	$ 0.41	$ 0.30	$ 1.50	$ 1.44	$ 2.77
Diluted earnings per common share	$ 0.27	$ 0.43	$ 0.48	$ 0.32	$ 0.33	$ 0.38	$ 0.41	$ 0.30	$ 1.49	$ 1.43	$ 2.72
Antidilutive awards excluded from computation of earnings per common share (in shares)									88	70

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Quarterly Financial Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Quarterly Financial Information Disclosure [Abstract]
Total operating revenue	$ 328,268	$ 342,317	$ 346,308	$ 301,495	$ 273,919	$ 288,714	$ 275,891	$ 232,662	$ 1,318,388	$ 1,071,186	$ 781,265
Operating income	31,933	49,681	55,132	37,244	38,023	44,556	34,959	26,844	173,990	144,382	68,873
Net income	$ 19,566	$ 30,884	$ 34,591	$ 23,419	$ 23,991	$ 27,657	$ 16,917	$ 7,883	$ 108,460	$ 76,448	$ 72,481
Net income per share, basic	$ 0.27	$ 0.43	$ 0.48	$ 0.32	$ 0.33	$ 0.38	$ 0.41	$ 0.30	$ 1.50	$ 1.44	$ 2.77
Net income per share, diluted	$ 0.27	$ 0.43	$ 0.48	$ 0.32	$ 0.33	$ 0.38	$ 0.41	$ 0.30	$ 1.49	$ 1.43	$ 2.72

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Statement of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating revenues:
Passenger	$ 782,792	$ 689,650	$ 537,969
Non-ticket	535,596	381,536	243,296
Total operating revenue	1,318,388	1,071,186	781,265
Operating expenses:
Aircraft fuel	471,763	388,046	248,206
Salaries, wages and benefits	218,919	181,742	156,443
Aircraft rent	143,572	116,485	101,345
Landing fees and other rents	68,368	52,794	48,118
Distribution	56,668	51,349	41,179
Maintenance, materials and repairs	49,460	34,017	27,035
Depreciation and amortization	15,256	7,760	5,620
Other operating	127,886	91,172	83,748
Loss on disposal of assets	956	255	77
Special charges (credits)	(8,450)	3,184	621
Total operating expenses	1,144,398	926,804	712,392
Operating income	173,990	144,382	68,873
Other (income) expense:
Interest expense	1,350	24,781	50,313
Capitalized interest	(1,350)	(2,890)	(1,491)
Interest income	(925)	(575)	(328)
Other expense	331	235	194
Total other (income) expense	(594)	21,551	48,688
Income before income taxes	174,584	122,831	20,185
Provision for income taxes	66,124	46,383	(52,296)
Net income	$ 108,460	$ 76,448	$ 72,481
Net income per share, basic	$ 1.50	$ 1.44	$ 2.77
Net income per share, diluted	$ 1.49	$ 1.43	$ 2.72

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Credit Card Processing Arrangements (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2012
Credit Card Processing Arrangements [Abstract]
Cash collateral required for credit card transactions as a percentage of air traffic liability, prior to amendment	100.00%
Cash holdback for credit card transactions	$ 0	$ 0
Maximum potential exposure to cash holdbacks by the credit card processors	$ 115,200,000	$ 144,800,000

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Statements of Shareholders’ Equity (Deficit) (USD $) In Thousands, unless otherwise specified	Total	Class A Common Stock	Class B Common Stock	Common Stock	Non-Voting Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings (Accumulated Deficit)
Balance at Dec. 31, 2009	$ (178,127)	$ 2	$ 1			$ 107		$ (178,237)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	569					569
Net income	72,481							72,481
Balance at Dec. 31, 2010	(105,077)	2	1	0	0	676	0	(105,756)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of Class A & B common stock to common stock		(2)	(1)	3
Proceeds from initial public offering, net	170,828			1		170,827
Conversion of debt to common stock	279,206			2		279,204
Conversion of preferred stock to common stock	81,747			1		81,746
Record liability under Tax Receivable Agreement	(36,522)					(36,522)
Share-based compensation	530					530
Repurchase of common stock	(886)					(757)	(129)
Conversion of common stock to non-voting common stock				(1)	1
Proceeds from options exercised	423					423
Net income	76,448							76,448
Other	9					9
Balance at Dec. 31, 2011	466,706	0	0	6	1	496,136	(129)	(29,308)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustment to liability recorded under Tax Receivable Agreement	1,497					1,497
Share-based compensation	4,327					4,327
Repurchase of common stock	(1,022)						(1,022)
Proceeds from options exercised	469					469
Tax benefit of options exercised	2,098					2,098
Net income	108,460							108,460
Balance at Dec. 31, 2012	$ 582,535	$ 0	$ 0	$ 6	$ 1	$ 504,527	$ (1,151)	$ 79,152

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Leases and Prepaid Maintenance Deposits - Future Minimum Lease Payments Under Noncancelable Operating Leases (Details) (USD $)	Dec. 31, 2012
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2013	$ 168,357
2014	166,539
2015	164,919
2016	160,354
2017	135,628
2018 and thereafter	379,027
Total minimum lease payments	1,174,824
Aircraft and Spare Engine Leases
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2013	152,558
2014	152,575
2015	152,961
2016	152,801
2017	131,849
2018 and thereafter	358,310
Total minimum lease payments	1,101,054
Property Facility Leases
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2013	15,799
2014	13,964
2015	11,958
2016	7,553
2017	3,779
2018 and thereafter	20,717
Total minimum lease payments	$ 73,770

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Operating Segments and Related Disclosures (Tables)

12 Months Ended

Dec. 31, 2012

Segment Reporting [Abstract]

Operating revenues by geographic region

Operating revenues by geographic region as defined by the Department of Transportation (DOT) area are summarized below:

	2012		2011		2010
	(in millions)
DOT—domestic	$	1,135.1	$	900.1	$	625.0
DOT—Latin America	183.3		171.1		156.3
Total	$	1,318.4	$	1,071.2	$	781.3

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Income Taxes - Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Change in valuation allowance	$ 0	$ 0	$ (65,248,000)
Deferred income tax benefit (loss)	29,255,000	44,180,000	(52,811,000)
Total income tax expense (benefit)	66,124,000	46,383,000	(52,296,000)
Federal tax credits	0	3,176,000
Net operating loss carryforwards for federal income tax purposes		20,800,000
State net operating loss carryforwards	2,200,000
Net operating loss carryforwards, portion attributed to the exercise of nonqualified stock options and the vesting of restricted stock		3,500,000
Current foreign tax expense (benefit)	$ 963,000	$ 263,000	$ 189,000

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Fair Value Measurements

12 Months Ended

Dec. 31, 2012

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

Under ASC 820, Fair Value Measurements and Disclosures, disclosures are required about how fair value is determined for assets and liabilities, and a hierarchy for which these assets and liabilities must be grouped is established, based on significant levels of inputs, as follows:

Level 1—Quoted prices in active markets for identical assets or liabilities.

Level 2—Observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The Company utilizes several valuation techniques in order to assess the fair value of the Company’s financial assets and liabilities. The Company’s fuel derivative contracts, which primarily consist of costless collar contracts, are valued using energy and commodity market data, which is derived by combining raw inputs with quantitative models and processes to generate forward curves and volatilities.

The Company utilizes the market approach to measure fair value for its financial assets and liabilities. The market approach uses prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities.

Assets and liabilities measured at fair value on a recurring basis are summarized below:

	Fair Value Measurements as of December 31, 2012
	Total		Level 1		Level 2		Level 3
	(in millions)
Cash and cash equivalents	$	416.8	$	416.8	$	—	$	—
Option contracts	0.3		—		—		0.3
Total assets	$	417.1	$	416.8	$	—	$	0.3
Total liabilities	$	—	$	—	$	—	$	—

	Fair Value Measurements as of December 31, 2011
	Total		Level 1		Level 2		Level 3
	(in millions)
Cash and cash equivalents	$	343.3	$	343.3	$	—	$	—
Option contracts	1.0		—		—		1.0
Total assets	$	344.3	$	343.3	$	—	$	1.0
Option contracts	0.7		$	—	$	—	$	0.7
Total liabilities	$	0.7	$	—	$	—	$	0.7

Cash and cash equivalents at December 31, 2012 and December 31, 2011 are comprised of liquid money market funds and cash. The Company maintains cash with various high-quality financial institutions. The Company had no transfers of assets or liabilities between any of the above levels during the years ended December 31, 2012 and 2011.

The Company did not elect hedge accounting on any of the derivative instruments, and as a result, changes in the fair values of these fuel hedge contracts are recorded each period in fuel expense. Fair values of the instruments are determined using standard option valuation models. The Company also considers counterparty risk and its own credit risk in its determination of all estimated fair values. The Company offsets fair value amounts recognized for derivative instruments executed with the same counterparty under a master netting arrangement. The Company determines the fair value of fuel derivative option contracts utilizing an option pricing model based on inputs that are either readily available in public markets or can be derived from information available in publicly quoted markets. The Company has consistently applied these valuation techniques in all periods presented and believes it has obtained the most accurate information available for the types of derivative contracts it holds.

Due to the fact that certain inputs utilized to determine the fair value of aircraft fuel derivatives are unobservable (principally implied volatility), the Company has categorized these derivatives as Level 3. Implied volatility of an option contract is the volatility of the price of the underlying that is implied by the market price of the option based on an option pricing model. Thus, it is the volatility that, when used in a particular pricing model, yields a theoretical value for the option equal to the current market price of that option. Implied volatility, a forward-looking measure, differs from historical volatility because the latter is calculated from known past returns. At each balance sheet date, the Company substantiates and adjusts unobservable inputs. The Company routinely assesses the valuation model's sensitivity to changes in implied volatility. Based on the Company's assessment of the valuation model's sensitivity to changes in implied volatility, it noted that holding other inputs constant, a significant increase (decrease) in implied volatility would result in a significantly higher (lower) determination of fair value measurement for the Company's aircraft fuel derivatives.

The Company's Valuation Group is made up of individuals from the Company's Risk Management, Treasury and Corporate Accounting departments. The Valuation Group is responsible for the Company's valuation policies, procedures and execution thereof. The Company's Valuation Group reports to the Company's Chief Financial Officer and Audit Committee who approve all derivative transactions. The Valuation Group compares the results of the Company's internally developed valuation methods with counterparty reports at each balance sheet date and assesses the Company's valuation methods for accurateness and identifies any needs for modification.

The following table presents the Company’s activity for assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3):

	Fuel Derivatives
	(in millions)
Balance at January 1, 2010	$	1.4
Total realized or unrealized gains (losses) included in earnings, net	3.5
Settlements, net	(1.4		)
Balance at December 31, 2010	3.5
Total realized or unrealized gains (losses) included in earnings, net	4.2
Settlements, net	(7.4		)
Balance at December 31, 2011	0.3
Total realized or unrealized gains (losses) included in earnings, net	(0.2		)
Settlements, net	0.2
Balance at December 31, 2012	$	0.3

The Company records the fair value adjustment of its aircraft fuel derivatives in the accompanying statement of operations within aircraft fuel and on the balance sheet within other current assets or other current liabilities, depending on whether the net fair value of the derivatives is in an asset or liability position as of the respective date.

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Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2012

Quarterly Financial Information Disclosure [Abstract]

Quarterly results of operations

Quarterly results of operations for the year ended December 31, 2012 are summarized below:

	Three Months Ended
	March 31		June 30		September 30		December 31
	(in thousands, except per share amounts)
2012
Operating revenue	$	301,495	$	346,308	$	342,317	$	328,268
Operating income	37,244		55,132		49,681		31,933
Net income	23,419		34,591		30,884		19,566
Basic earnings per share	0.32		0.48		0.43		0.27
Diluted earnings per share	0.32		0.48		0.43		0.27
2011
Operating revenue	$	232,662	$	275,891	$	288,714	$	273,919
Operating income	26,844		34,959		44,556		38,023
Net income	7,883		16,917		27,657		23,991
Basic earnings per share	0.30		0.41		0.38		0.33
Diluted earnings per share	0.30		0.41		0.38		0.33

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Initial Public Offering and Tax Receivable Agreement

12 Months Ended

Dec. 31, 2012

Initial Public Offering and Tax Receivable Agreement [Abstract]

Initial Public Offering and Tax Receivable Agreement

Initial Public Offering and Tax Receivable Agreement

On June 1, 2011, the Company raised $187.2 million of gross proceeds from an initial public offering of 15,600,000 shares of its common stock at a price of $12.00 per share. The resulting proceeds to the Company were approximately $176.9 million, after deducting underwriter commissions. The Company retained $150.0 million of the net proceeds, after paying $20.6 million of debt, $0.5 million to pay three unaffiliated holders of its subordinated notes, and $5.9 million in direct costs of the offering. In accordance with a Recapitalization Agreement, all of the principal and accrued and unpaid interest on outstanding notes, to the extent not paid, totaling $279.2 million, as well as all of the Class A and B preferred stock outstanding immediately prior to the offering along with accrued and unpaid dividends totaling $81.7 million, were exchanged for 30,079,420 shares of common stock at a share price of $12.00 per share. Each share of Class B Common Stock was exchanged for one share of common stock. In addition, interest expense was reduced by $0.4 million due to a write off of the unamortized portion of prepaid loan fees and deferred interest.

The Company entered into the TRA with the Pre-IPO Stockholders effective immediately prior to the consummation of the IPO. Under the TRA, the Company is obligated to pay to the Pre-IPO Stockholders an amount equal to 90% of the cash savings in federal income tax realized by it by virtue of the use of the federal net operating loss, deferred interest deductions and alternative minimum tax credits held by the Company as of March 31, 2011. Cash tax savings generally will be computed by comparing actual federal income tax liability to the amount of such taxes that the Company would have been required to pay had such Pre-IPO NOLs (as defined in the TRA) not been available. Upon consummation of the IPO and execution of the TRA, the Company recorded a liability with an offsetting reduction to additional paid in capital. During 2012, management adjusted for an immaterial error in the original estimation of the liability. This adjustment reduced the liability with an offset to additional paid in capital.

The term of the TRA will continue until the first to occur of (a) the full payment of all amounts required under the agreement with respect to utilization or expiration of all of the Pre-IPO NOLs, (b) the end of the taxable year including the tenth anniversary of the IPO or (c) a change in control of the Company. The amount and timing of payments under the TRA will depend upon a number of factors, including, but not limited to, the amount and timing of taxable income generated in the future and any future limitations that may be imposed on the Company's ability to use the Pre-IPO NOLs. The Company paid $27.2 million, or 90% of the tax savings realized from the utilization of NOLs in 2011, including $0.3 million of applicable interest in 2012 related to the TRA. As of December 31, 2012 an estimated remaining cash benefit of $8.0 million is expected to be paid to the Pre-IPO Stockholders under the terms of the TRA in 2013.

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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) (Recurring, USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Total
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 416.8	$ 343.3
Total assets	417.1	344.3
Total liabilities	0	0.7
Total | Option Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0.3	1.0
Derivative liabilities		0.7
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	416.8	343.3
Total assets	416.8	343.3
Total liabilities	0	0
Level 1 | Option Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0
Derivative liabilities		0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Total assets	0	0
Total liabilities	0	0
Level 2 | Option Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0
Derivative liabilities		0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Total assets	0.3	1.0
Total liabilities	0	0.7
Level 3 | Option Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0.3	1.0
Derivative liabilities		$ 0.7

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Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2012

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

Basis of Presentation

Spirit Airlines, Inc. (Spirit or the Company) headquartered in Miramar, Florida, is an ultra low-cost, low-fare airline that provides affordable travel opportunities principally throughout the domestic United States, the Caribbean and Latin America. The Company manages operations on a system-wide basis due to the interdependence of its route structure in the various markets served. As only one service is offered (i.e., air transportation), management has concluded that there is only one reportable segment.

Certain prior period amounts have been reclassified to conform to the current year's presentation.

Use of Estimates

The preparation of financial statements in conformity with generally accepted accounting principles in the United States of America requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from these estimates.

Cash and Cash Equivalents

The Company considers all highly liquid investments with maturities of less than three months at the date of acquisition to be cash equivalents. Investments included in this category primarily consist of money market funds.

Restricted Cash

Restricted cash primarily consists of funds held by credit card processors as collateral for future travel paid with a credit card.

Accounts Receivable

Accounts receivable primarily consist of amounts due from credit card processors associated with the sales of tickets and amounts due from counterparties associated with fuel derivative instruments that have settled. The allowance for doubtful accounts was immaterial as of December 31, 2012, 2011 and 2010.

In addition, the provision for doubtful accounts and write-offs for 2012, 2011 and 2010 were each immaterial.

Deferred Offering Costs

The Company complies with the requirements of SEC Staff Accounting Bulletin (SAB) Topic 5A—“Expenses of Offering.” Deferred offering costs consisted principally of legal, accounting, printing, and underwriting fees related to the Company's initial public offering (the IPO). A total of $6.1 million in deferred offering costs were charged to additional paid-in capital net of proceeds in connection with the consummation of the IPO in 2011.

Property and Equipment

Property and equipment are stated at cost, less accumulated depreciation and amortization. Depreciation of operating property and equipment is computed using the straight-line method applied to each unit of property, except on flight equipment (major rotable parts, avionics, and assemblies), which are depreciated on a group basis over the average life of the applicable equipment. During 2012, the Company wrote off approximately $15.3 million in fully depreciated and out-of-service assets and recorded a corresponding entry to accumulated depreciation.

The depreciable lives used for the principal depreciable asset classifications are:

	Estimated Useful Life
Spare rotables and flight assemblies	Lesser of the useful life of equipment or average remaining fleet life
Other equipment and vehicles	5 to 7 years
Internal use software	3 to 10 years

All aircraft and spare engines are financed through operating leases with terms of 3 to 12 years for aircraft and 7 to 12 years for spare engines. Residual values for major spare rotable parts, avionics, and assemblies are estimated to be 10%.

The following table illustrates the components of depreciation and amortization expense:

	Year Ended December 31,
	2012		2011		2010
	(in thousands)
Depreciation	$	6,156	$	5,186	$	4,313
Amortization of heavy maintenance	9,100		2,574		1,307
Total depreciation and amortization	$	15,256	$	7,760	$	5,620

The Company capitalizes certain internal and external costs associated with the acquisition and development of internal use software for new products, and enhancements to existing products that have reached the application development stage and meet recoverability tests. Capitalized costs include external direct costs of materials and services utilized in developing or obtaining internal-use software, and labor cost for employees who are directly associated with and devote time to internal-use software projects. These costs are included in property and equipment.

Amortization of capitalized software development costs is charged to depreciation on a straight-line method basis. Amortization of capitalized software development costs was $3.2 million, $2.0 million, and $1.1 million for the years ended 2012, 2011, and 2010, respectively. The Company capitalized $2.3 million, $3.3 million, and $2.4 million, of software development costs during the years ended 2012, 2011, and 2010, respectively.

Measurement of Asset Impairments

The Company records impairment charges on long-lived assets used in operations when events and circumstances indicate that the assets may be impaired, the undiscounted cash flows estimated to be generated by those assets are less than the carrying amount of those assets, and the net book value of the assets exceeds their estimated fair value. In making these determinations, the Company uses certain assumptions, including, but not limited to: (i) estimated fair value of the assets; and (ii) estimated, undiscounted future cash flows expected to be generated by these assets, which are based on additional assumptions such as asset utilization, length of service the asset will be used in the Company’s operations, and estimated salvage values.

Capitalized Interest

Interest attributable to funds used to finance the acquisition of new aircraft is capitalized as an additional cost of the related asset. Capitalization of interest ceases when the asset is no longer being prepared for its intended use or is ready for service.

Passenger Revenue Recognition

Tickets sold are initially deferred as “air traffic liability.” Passenger revenue is recognized at time of departure when transportation is provided. A nonrefundable ticket expires at the date of scheduled travel and is recognized as revenue at the date of scheduled travel.

Customers may elect to change their itinerary prior to the date of departure. A service charge is assessed and recognized on the date the change is initiated and is deducted from the face value of the original purchase price of the ticket, and the original ticket becomes invalid. The amount remaining after deducting the service charge is called a credit shell which expires 60 days from the date the credit shell is created and can be used towards the purchase of a new ticket and the Company’s other service offerings. The amount of credits expected to expire is recognized as revenue upon issuance of the credit and is estimated based on historical experience. Estimating the amount of credits that will go unused involves some level of subjectivity and judgment.

The Company is also required to collect certain taxes and fees from customers on behalf of government agencies and airports and remit these back to the applicable governmental entity or airport on a periodic basis. These taxes and fees include U.S. federal transportation taxes, federal security charges, airport passenger facility charges, and foreign arrival and departure taxes. These items are collected from customers at the time they purchase their tickets, but are not included in passenger revenue. The Company records a liability upon collection from the customer and relieves the liability when payments are remitted to the applicable governmental agency or airport.

Frequent Flier Program

Flown Miles. The Company records a liability for mileage credits earned by passengers, including mileage credits for members with an insufficient number of mileage credits to earn an award, under its FREE SPIRIT program based on the estimated incremental cost of providing free travel for credits that are expected to be redeemed. Incremental costs include fuel, insurance, security, ticketing, and facility charges reduced by an estimate of fees required to be paid by the passenger when redeeming the award.

Original Affinity Card Program. The Company also sells mileage credits to companies participating in the FREE SPIRIT program (or affinity card program). Under the original affinity card program, funds received from the sale of mileage credits were accounted for as a multiple element arrangement and allocated to a marketing component and a transportation component (mileage credits) using the residual method. The fair value of the transportation component was deferred and recognized ratably as passenger revenue over the estimated period the transportation was expected to be provided which was estimated at 16 months. The difference between the funds received and the fair value of the transportation component was recognized in non-ticket revenue at the time of sale as non-ticket marketing revenue. The marketing component represented the Company’s compensation for use of its trademark, customer lists and placement of marketing materials to encourage application for credit cards. Because there were no undelivered elements other than the mileage credits, the Company recorded the revenue from the marketing component when funds were received. The Company also received bonuses from companies participating in the FREE SPIRIT program that are driven by the volume of the usage of the Company’s co-branded credit cards. The Company recognized these bonuses as non-ticket revenue when payment was received (milestone method) as the milestones are substantive.

During the fourth quarter of 2010, the Company determined not to renew its agreement with the administrator of the FREE SPIRIT affinity credit card program at the scheduled expiration in February 2011. In connection with that non-renewal, the Company entered into an agreement with the former administrator regarding the transition of the program to a new provider and the remittance to the Company of compensation due to the Company for card members obtained through the Company’s marketing services in the amount of $5.0 million, of which $4.6 million was recognized in the fourth quarter of 2010 and $0.4 million was recognized in the first quarter of 2011.

New Affinity Card Program. The Company entered into a new affinity card program that became effective April 1, 2011. The agreement calls for the marketing of a co-branded Spirit credit card and the delivery of award miles over the five-year contract term. At the inception of the arrangement, the Company evaluated all deliverables in the arrangement to determine whether they represent separate units of accounting using the criteria as set forth in ASU No. 2009-13. The Company determined the arrangement had three separate units of accounting: (i) travel miles to be awarded, (ii) licensing of brand and access to member lists, and (iii) advertising and marketing efforts. Under ASU No. 2009-13, arrangement consideration should be allocated based on relative selling price. At inception of the arrangement, the Company established the relative selling price for all deliverables that qualified for separation. The manner in which the selling price was established was based on a hierarchy of evidence that the Company considered. Total arrangement consideration was then allocated to each deliverable on the basis of the deliverable’s relative selling price. In considering the hierarchy of evidence under ASU No. 2009-13, the Company first determined whether vendor specific objective evidence of selling price or third-party evidence of selling price existed. It was determined by the Company that neither vendor specific objective evidence of selling price nor third-party evidence existed due to the uniqueness of the Company’s program. As such, the Company developed its best estimate of the selling price for all deliverables. For the award miles, the Company considered a number of entity-specific factors when developing the best estimate of the selling price including the number of miles needed to redeem an award, average fare of comparable segments, breakage, restrictions, and other charges. For licensing of brand and access to member lists, the Company considered both market-specific factors and entity-specific factors including general profit margins realized in the marketplace/industry, brand power, market royalty rates, and size of customer base. For the advertising element, the Company considered market-specific factors and entity-specific factors including, the Company’s internal costs (and fluctuations of costs) of providing services, volume of marketing efforts, and overall advertising plan. Consideration allocated based on the relative selling price to both brand licensing and advertising elements is recognized as revenue when earned and recorded in non-ticket revenue. Consideration allocated to award miles is deferred and recognized ratably as passenger revenue over the estimated period the transportation is expected to be provided which is estimated at 16 months. The Company used entity-specific assumptions coupled with the various judgments necessary to determine the selling price of a deliverable in accordance with the required selling price hierarchy. Changes in these assumptions (e.g., cost of fare, number of miles to redeem awards, marketing plan, and approval rate of credit cards) could result in changes in the estimated selling prices. Determining the frequency to reassess selling price for individual deliverables requires significant judgment. Mileage credits that expire under the terms of the Company's policy or are not likely to be redeemed are collectively referred to as breakage. The Company estimates and recognizes breakage on its frequent flier miles in proportion to actual mileage redemptions, in accordance with the redemption recognition method.

The following table illustrates total cash proceeds received from the sale of mileage credits and the portion of such proceeds recognized in revenue immediately as marketing component:

	Cash proceeds from sale of miles to non-airline third parties		Portion of proceeds recognized immediately as marketing component
Year Ended	(in thousands)
December 31, 2012	$	24,938	$	20,998
December 31, 2011	20,954		16,580
December 31, 2010	20,748		10,576

The total liability for future FREE SPIRIT award redemptions and unrecognized revenue from the sale of mileage credits was $2.4 million and $3.7 million at December 31, 2012 and 2011, respectively. These balances are recorded as a component of air traffic liability in the accompanying balance sheets.

Non-ticket Revenue Recognition

Non-ticket revenues are generated from air travel-related services for baggage, bookings through the Company’s call center or third-party vendors, advance seat selection, itinerary changes and loyalty programs. Non-ticket revenues also consist of services not directly related to providing transportation such as the FREE SPIRIT affinity credit card program, $9 Fare Club, and the sale of advertising to third parties on Spirit’s website and on board aircraft.

The following table summarizes the primary components of non-ticket revenue and the revenue recognition method utilized for each service or product:

		Year Ended December 31,
Non-ticket revenue	Recognition method	2012		2011		2010
		(in thousands)
Baggage	Time of departure	$	217,536	$	168,290	$	91,393
Passenger usage fee	Time of departure	149,577		71,757		47,367
Advance seat selection	Time of departure	48,956		42,112		32,512
Service charges for changes and cancellations	When itinerary is changed	27,762		25,927		23,120
Other		91,765		73,450		48,904
Non-ticket revenue		$	535,596	$	381,536	$	243,296

Charges for services recognized at time of departure are initially recorded as a liability until time of departure. The passenger usage fee is charged for tickets sold through the Company’s primary sales distribution channels, to cover the Company’s distribution costs. The primary sales distribution channels for which passenger usage fees are charged include sales through the Company’s website, sales through the third-party provided call center, and sales through travel agents; the Company does not charge a passenger usage fee for sales made at its airport ticket counters. Other non-ticket revenues include revenues from other air related charges as well as non-air related charges. Other air related charges include optional services and products provided to passengers such as on-board products, travel insurance, and use of the Company’s call center or travel agents, among others. Non-air related charges primarily consist of revenues from advertising on the Company’s aircraft and website, the Company’s $9 Fare Club subscription-based membership program, and the Company’s FREE SPIRIT affinity credit card program.

Airframe and Engine Maintenance

The Company accounts for heavy maintenance and major overhaul and repair under the deferral method whereby the cost of heavy maintenance and major overhaul and repair is deferred and amortized based on usage through the next overhaul event.

Amortization of heavy maintenance and major overhaul costs is charged to depreciation and amortization expense and was $9.1 million , $2.6 million, and $1.3 million for the years ended 2012, 2011, and 2010, respectively. During the years ended 2012, 2011, and 2010, the Company deferred $61.6 million, $22.1 million, and $5.2 million, respectively, of costs for heavy maintenance. Accumulated heavy maintenance amortization was $14.0 million, $4.9 million, and $2.3 million for the years ended 2012 and 2011, and 2010

The Company outsources certain routine, non-heavy maintenance functions under contracts that require payment on a utilization basis, such as flight hours. Costs incurred for maintenance and repair under flight hour maintenance contracts, where labor and materials price risks have been transferred to the service provider, are expensed based on contractual payment terms. All other costs for routine maintenance of the airframes and engines are charged to expense as performed.

The table below summarizes the extent to which the Company’s maintenance costs are rate capped due to flight hour maintenance contracts:

	Year Ended December 31,
	2012		2011		2010
	(in thousands)
Flight hour-based maintenance expense	$	25,748	$	21,974	$	16,683
Non-flight hour-based maintenance expense	23,712		12,043		10,352
Total maintenance expense	$	49,460	$	34,017	$	27,035

Leased Aircraft Return Costs

Costs associated with returning leased aircraft are accrued when it is probable that a cash payment will be made and that amount is reasonably estimable. Any accrual is based on time remaining on the lease, planned aircraft usages, and the provisions included in the lease agreement, although the actual amount due to any lessor upon return will not be known with certainty until lease termination.

Aircraft Fuel

Aircraft fuel expense includes jet fuel and associated “into-plane” costs, taxes, oil, and all gains and losses associated with fuel hedge contracts.

Derivative Instruments

The Company accounts for derivative financial instruments at fair value and recognizes them in the balance sheet in other current assets or other current liabilities. For derivatives designated as cash flow hedges, changes in fair value of the derivative are generally reported in other comprehensive income and are subsequently reclassified into earnings when the hedged item affects earnings. For the years ended 2012, 2011 and 2010, the Company did not hold derivative instruments that qualified as cash flow hedges for accounting purposes. As a result, changes in the fair value of such derivative contracts were recorded within aircraft fuel expense in the accompanying statements of operations. These amounts include both realized gains and losses and mark-to-market adjustments of the fair value of unsettled derivative instruments at the end of each period.

Advertising

The Company expenses advertising and the production costs of advertising as incurred. Marketing and advertising expenses were $2.4 million, $2.5 million, and $4.0 million for the years ended 2012, 2011 and 2010, respectively.

Income Taxes

The Company accounts for income taxes using the liability method. The Company records a valuation allowance to reduce the deferred tax assets reported if, based on the weight of the evidence, it is more likely than not that some portion or all of the deferred tax assets will be not realized.

Interest Expense

Related-party interest expense incurred during 2012, 2011 and 2010 was $0.0 million, $21.0 million, and $44.6 million, respectively, and consisted primarily of paid-in-kind interest on tranche notes due to related parties and preferred stock dividends due to related parties. Non-related party interest expense during 2012, 2011 and 2010 was $1.4 million, $3.8 million and $5.7 million, respectively.

Stock-Based Compensation

The Company recognizes cost of employee services received in exchange for awards of equity instruments based on the fair value of each instrument at the date of grant. Compensation expense is recognized on a straight-line basis over the period during which an employee is required to provide service in exchange for an award. The Company has issued and outstanding restricted stock awards, stock option awards, and performance share awards. Restricted stock awards are valued at the fair value of the shares on the date of grant if vesting is based on a service or a performance condition. To the extent a market price was not available, the fair value of stock awards was estimated using a discounted cash flow analysis based on management’s estimates of revenue, driven by assumed market growth rates, and estimated costs as well as appropriate discount rates. These estimates are consistent with the plans and estimates that management uses to manage the Company’s business. The fair value of share option awards is estimated on the date of grant using the Black-Scholes valuation model. The fair value of performance share awards is estimated through the use of a Monte Carlo simulation model. See Note 8 for additional information.

Concentrations of Risk

The Company’s business has been, and may continue to be, adversely affected by increases in the price of aircraft fuel, the volatility of the price of aircraft fuel, or both. Aircraft fuel was the Company’s single largest expenditure representing approximately 41%, 42%, and 35% of total operating expenses in 2012, 2011, and 2010, respectively.

The Company’s operations are largely concentrated in the southeast United States with Fort Lauderdale being the highest volume fueling point in the system. Gulf Coast Jet indexed fuel is the basis for a substantial majority of the Company’s fuel consumption. Any disruption to the oil production or refinery capacity in the Gulf Coast, as a result of weather or any other disaster or disruptions in supply of jet fuel, dramatic escalations in the costs of jet fuel, and/or the failure of fuel providers to perform under fuel arrangements for other reasons could have a material adverse effect on the Company’s financial condition and results of operations.

The Company’s operations will continue to be vulnerable to weather conditions (including hurricane season or snow and severe winter weather), which could disrupt service, create air traffic control problems, decrease revenue, and increase costs.

Due to the relatively small size of the fleet and high utilization rate, the unavailability of one or more aircraft and resulting reduced capacity could have a material adverse effect on the Company’s business, results of operations, and financial condition.

The Company has three union-represented employee groups that together represent approximately 54% and 52% of all employees at December 31, 2012 and 2011, respectively. A strike or other significant labor dispute with the Company’s unionized employees is likely to adversely affect the Company’s ability to conduct business. Additional disclosures are included in Note 15.

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Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 416,816	$ 343,328
Accounts receivable, net	22,740	15,425
Deferred income taxes	12,591	20,738
Other current assets	95,210	63,217
Total current assets	547,357	442,708
Property and equipment:
Flight equipment	2,648	4,182
Ground and other equipment	43,580	46,608
Less accumulated depreciation	(17,825)	(27,580)
Total property and equipment	28,403	23,210
Deposits on flight equipment purchase contracts	96,692	91,450
Aircraft maintenance deposits	122,379	120,615
Deferred heavy maintenance and other long-term assets	125,053	67,830
Total assets	919,884	745,813
Current liabilities:
Accounts payable	24,166	15,928
Air traffic liability	131,414	112,280
Other current liabilities	121,314	98,856
Total current liabilities	276,894	227,064
Long-term deferred income taxes	33,216	12,108
Deferred credits and other long-term liabilities	27,239	39,935
Shareholders’ equity:
Additional paid-in-capital	504,527	496,136
Treasury stock, at cost	(1,151)	(129)
Retained earnings (deficit)	79,152	(29,308)
Total shareholders’ equity	582,535	466,706
Total liabilities and shareholders’ equity	919,884	745,813
Common Stock
Shareholders’ equity:
Common stock	6	6
Non-Voting Common Stock
Shareholders’ equity:
Common stock	$ 1	$ 1

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Leases and Prepaid Maintenance Deposits

12 Months Ended

Dec. 31, 2012

Leases And Prepaid Maintenance Deposits [Abstract]

Leases and Prepaid Maintenance Deposits

Leases and Prepaid Maintenance Deposits

The Company leases various types of equipment and property, primarily aircraft, spare engines and airport facilities under leases, which expire in various years through 2032. Lease terms are generally 3 to 12 years for aircraft and up to 20 years for other leased equipment and property.

Total rental expense for all leases charged to operations for the years ended 2012, 2011, and 2010 was $172.4 million, $139.1 million, and $122.7 million, respectively. Total rental expense charged to operations for aircraft and engine operating leases for the years ended December 31, 2012, 2011, and 2010 was $143.6 million, $116.5 million, and $101.3 million, respectively.

Some of the Company’s master lease agreements provide that the Company pays maintenance reserves to aircraft lessors to be held as collateral in advance of the Company’s required performance of major maintenance activities. Some maintenance reserve payments are fixed contractual amounts, while others are based on actual flight hours. Fixed maintenance reserve payments for these aircraft and related flight equipment, including estimated amounts for contractual price escalations, will be approximately $10.3 million in 2013, $10.6 million in 2014, $11.0 million in 2015, $11.4 million in 2016, $11.1 million in 2017, and $40.4 million in 2018 and beyond. These lease agreements provide that maintenance reserves are reimbursable to the Company upon completion of the maintenance event in an amount equal to the lesser of (1) the amount of the maintenance reserve held by the lessor associated with the specific maintenance event or (2) the qualifying costs related to the specific maintenance event. Substantially all of these maintenance reserve payments are calculated based on a utilization measure, such as flight hours or cycles, and are used solely to collateralize the lessor for maintenance time run off the aircraft until the completion of the maintenance of the aircraft.

At lease inception and at each balance sheet date, the Company assesses whether the maintenance reserve payments required by the master lease agreements are substantively and contractually related to the maintenance of the leased asset. Maintenance reserve payments that are substantively and contractually related to the maintenance of the leased asset are accounted for as maintenance deposits. Maintenance deposits expected to be recovered from lessors are reflected as prepaid maintenance deposits in the accompanying balance sheets. When it is not probable the Company will recover amounts currently on deposit with a lessor, such amounts are expensed as supplemental rent. As of December 31, 2012 and 2011, the Company had aircraft maintenance deposits of $198.5 million and $168.8 million, respectively, on its balance sheets of which $76.1 million and $48.2 million, respectively, are included within other current assets on its balance sheets. The Company has concluded that these prepaid maintenance deposits are probable of recovery primarily due to the rate differential between the maintenance reserve payments and the expected cost for the related next maintenance event that the reserves serve to collateralize.

The Company’s master lease agreements also provide that most maintenance reserves held by the lessor at the expiration of the lease are nonrefundable to the Company and will be retained by the lessor. Consequently, any usage-based maintenance reserve payments after the last major maintenance event are not substantively related to the maintenance of the leased asset and therefore are accounted for as contingent rent. The Company accrues for contingent rent beginning when it becomes probable and reasonably estimable the Company will incur such nonrefundable maintenance reserve payments. The Company makes certain assumptions at the inception of the lease and at each balance sheet date to determine the recoverability of maintenance deposits. These assumptions are based on various factors such as the estimated time between the maintenance events, the date the aircraft is due to be returned to the lessor, and the number of flight hours the aircraft is estimated to be utilized before it is returned to the lessor. The Company expensed $2.0 million, $1.5 million, and $0.0 million as supplemental rent during 2012, 2011, and 2010, respectively. Maintenance reserves held by lessors that are refundable to the Company at the expiration of the lease are accounted for as prepaid maintenance deposits on the balance sheet when they are paid.

At December 31, 2012, the Company had its entire fleet of 45 aircraft and eight spare engines financed under operating leases with lease term expiration dates ranging from 2016 to 2024. Five of the leased aircraft have variable rent payments, which fluctuate based on changes in LIBOR (London Interbank Offered Rate). The Company has the option to renew 17 of the leases for three-year periods with contractual notice required in the 10th year. 16 of the aircraft leases and all of the engine leases were the result of sale-lease-back transactions. Deferred gains or losses from sale-lease-back transactions are amortized over the term of the lease as a reduction in rent or additional rent, respectively. Losses are deferred when the fair value of the aircraft or engine is higher than the price it was sold for, in substance, a prepayment of rent. A loss on disposal is recorded at the time of sale for the excess of the carrying amount over the fair value of the aircraft or engine. The costs of returning aircraft to lessors, or lease return conditions, are accounted for in a manner similar to the accounting for contingent rent. These costs are recognized over the remaining life of the lease as aircraft hours accumulate, beginning from the time when the Company determines it is probable such costs will be incurred and can generally be estimated. Such estimated costs exclude the costs of maintenance events that are covered by reserves on deposit with the relevant lessor, or routine maintenance costs that are recorded in maintenance expense.

During 2012, the Company entered into sale and leaseback transactions with third-party aircraft lessors for the sale and leaseback of seven Airbus A320 aircraft that resulted in deferred losses of $5.0 million, which are included in deferred heavy maintenance and other long-term assets within the balance sheet. The deferred losses will be recognized as rent expense on a straight-line basis over the term of the respective operating leases. The Company had agreements in place prior to the delivery of these aircraft which resulted in the settlement of the purchase obligation by the lessor and the refund of $40.5 million in pre-delivery deposits from Airbus during 2012. The refunded pre-delivery deposits have been disclosed in the statement of cash flows as investing activities within pre-delivery deposits, net of refunds. In addition, the Company entered into sale and leaseback transactions with third-party lessors for the sale and leaseback of two V2500 IAE International Aero Engines AG engines. Cash outflows related to the purchase of the engine have been disclosed in the statement of cash flows as investing activities within purchases of property and equipment and the cash inflows from the sale of the engine as financing activities within proceeds received on sale lease back transactions. All of the leases from these sale and leaseback transactions are accounted for as operating leases. Under the terms of the lease agreements, the Company will continue to operate and maintain the aircraft. Payments under the lease agreements are fixed for the term of the lease. The lease agreements contain standard termination events, including termination upon a breach of the Company's obligations to make rental payments and upon any other material breach of the Company's obligations under the leases, and standard maintenance and return condition provisions. Upon a termination of the lease due to a breach by the Company, the Company would be liable for standard contractual damages, possibly including damages suffered by the lessor in connection with remarketing the aircraft or while the aircraft is not leased to another party.

Future minimum lease payments under noncancelable operating leases with initial or remaining terms in excess of one year at December 31, 2012 were as follows:

	Operating Leases
As of December 31,	Aircraft and Spare Engine Leases		Property Facility Leases		Total Operating Leases
	(in thousands)
2013	$	152,558	$	15,799	$	168,357
2014	152,575		13,964		166,539
2015	152,961		11,958		164,919
2016	152,801		7,553		160,354
2017	131,849		3,779		135,628
2018 and thereafter	358,310		20,717		379,027
Total minimum lease payments	$	1,101,054	$	73,770	$	1,174,824

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Document and Entity Information Document (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Feb. 11, 2013	Jun. 30, 2012
Document And Entity Information [Abstract]
Entity Registrant Name	SPIRIT AIRLINES, INC.
Entity Central Index Key	0001498710
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2012
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2012
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 979.1
Entity Common Stock, Shares Outstanding		72,531,027

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Financial Instruments and Risk Management

12 Months Ended

Dec. 31, 2012

Investments, All Other Investments [Abstract]

Financial Instruments and Risk Management

Financial Instruments and Risk Management

As part of the Company’s risk management program, the Company from time to time uses a variety of financial instruments to reduce its exposure to fluctuations in the price of jet fuel. The Company does not hold or issue derivative financial instruments for trading purposes.

The Company is exposed to credit losses in the event of nonperformance by counterparties to these financial instruments. The Company periodically reviews and seeks to mitigate exposure to the financial deterioration and nonperformance of any counterparty by monitoring the absolute exposure levels, each counterparty's credit ratings, and the historical performance of the counterparties relating to hedge transactions. The credit exposure related to these financial instruments is limited to the fair value of contracts in a net receivable position at the reporting date. The Company also maintains security agreements that require the Company to post collateral if the value of selected instruments falls below specified mark-to-market thresholds.

The Company records financial derivative instruments at fair value, which includes an evaluation each counterparty's credit risk. Fair value of the instruments is determined using standard option valuation models.

Management chose not to elect hedge accounting on any derivative instruments entered into during 2012, 2011, and 2010 and, as a result, changes in the fair value of these fuel hedge contracts are recorded each period in aircraft fuel expense.

The following table summarizes the components of aircraft fuel expense for the years ended December 31, 2012, 2011 and 2010:

	Year Ended December 31,
	2012		2011			2010
	(in thousands)
Into-plane fuel cost	$	471,542	$	392,278		$	251,754
Settlement losses (gains)	175		(7,436		)	(1,483		)
Unrealized mark-to-market losses (gains)	46		3,204			(2,065		)
Aircraft fuel	$	471,763	$	388,046		$	248,206

All realized gains and losses are reflected in the statements of cash flows in cash flow from operating activities.

As of December 31, 2012 and 2011, the Company had fuel hedges using U.S. Gulf Coast jet fuel collars as the underlying commodity. As of December 31, 2012, the Company had agreements in place to protect 7.8 milliongallons or approximately 5% of its 2013 anticipated fuel consumption at a weighted-average ceiling and floor price of $3.09 and $2.84 per gallon, respectively. As of December 31, 2011, the Company had agreements in place to protect 13.5 milliongallons or approximately 9% of its 2012 anticipated fuel consumption at a weighted-average ceiling and floor price of $2.99 and $2.81 per gallon, respectively.

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Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Treasury stock, shares	60,040	8,215
Common Stock
Common stock, par value (in dollars per share)	0.0001	0.0001
Common stock, shares authorized	240,000,000	240,000,000
Common stock, shares issued	70,861,822	61,954,576
Common stock, shares outstanding	70,801,782	61,946,361
Non-Voting Common Stock
Common stock, par value (in dollars per share)	0.0001	0.0001
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	1,669,205	10,576,180
Common stock, shares outstanding	1,669,205	10,576,180

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Accrued Liabilities

12 Months Ended

Dec. 31, 2012

Payables and Accruals [Abstract]

Accrued Liabilities

Accrued Liabilities

Accrued liabilities included in other current liabilities as of December 31, 2012 and 2011 consist of the following:

	As of December 31,
	2012		2011
	(in thousands)
Federal excise and other passenger taxes and fees payable	$	23,401	$	17,813
Aircraft maintenance	22,319		7,816
Salaries and wages	21,057		17,123
Airport expenses	16,024		10,682
Fuel	11,219		87
Aircraft and facility rent	8,020		7,206
Current portion of tax receivable agreement	7,987		27,399
Other	11,287		10,730
Accrued liabilities	$	121,314	$	98,856

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Credit Card Processing Arrangements

12 Months Ended

Dec. 31, 2012

Credit Card Processing Arrangements [Abstract]

Credit Card Processing Arrangements

Credit Card Processing Arrangements

The Company has agreements with organizations that process credit card transactions arising from the purchase of air travel, baggage charges, and other ancillary services by customers. As it is standard in the airline industry, the Company's contractual arrangements with credit card processors permit them, under certain circumstances, to retain a holdback or other collateral, which the Company records as restricted cash, when future air travel and other future services are purchased via credit card transactions. The required holdback is the percentage of the Company's overall credit card sales that its credit card processors hold to cover refunds to customers if the Company fails to fulfill its flight obligations.

During 2011, the Company amended its processing agreements with all of its processors. Prior to the amendments, the credit card processors required the Company to maintain cash collateral equal to approximately 100% of the Company's air traffic liability. The amendments were approved in light of the Company's improved balance sheet as a result of the IPO, the related recapitalization and the elimination of the holdback held by the credit card processors, effectively eliminating the Company's restricted cash balance, provided that the Company continues to satisfy certain liquidity and other financial covenants. Failure to meet these covenants would provide the processors the right to reinstate a holdback, resulting in a commensurate reduction of unrestricted cash. As of December 31, 2012 and 2011, the Company continued to be in compliance with its credit card processing agreements, and the processors were holding back $0 of remittances.

The maximum potential exposure to cash holdbacks by the Company's credit card processors, based upon advance ticket sales and $9 Fare Club memberships as of December 31, 2012 and 2011, was $144.8 million and $115.2 million, respectively.

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Operating Segments and Related Disclosures

12 Months Ended

Dec. 31, 2012

Segment Reporting [Abstract]

Operating Segments and Related Disclosures

Operating Segments and Related Disclosures

The Company is managed as a single business unit that provides air transportation for passengers. Operating revenues by geographic region as defined by the Department of Transportation (DOT) area are summarized below:

	2012		2011		2010
	(in millions)
DOT—domestic	$	1,135.1	$	900.1	$	625.0
DOT—Latin America	183.3		171.1		156.3
Total	$	1,318.4	$	1,071.2	$	781.3

During 2012, 2011, and 2010, no revenue from any one foreign country represented greater than 4% of the Company’s total passenger revenue. The Company attributes operating revenues by geographic region based upon the origin and destination of each passenger flight segment. The Company’s tangible assets consist primarily of flight equipment, which are mobile across geographic markets and, therefore, have not been allocated.

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Defined Contribution 401(k) Plan

12 Months Ended

Dec. 31, 2012

Postemployment Benefits [Abstract]

Defined Contribution 401(k) Plan

Defined Contribution 401(k) Plan

The Company sponsors three defined contribution 401(k) plans, Spirit Airlines, Inc. Employee Retirement Savings Plan (first plan), Spirit Airlines, Inc. Pilots’ Retirement Savings Plan (second plan), and Spirit Airlines, Inc. Puerto Rico Retirement Savings Plan (third plan). The first plan was adopted on February 1, 1994. Essentially, all employees that are not covered by the pilots’ collective bargaining agreement, who have at least one year of service, have worked at least 1,000 hours during the year, and have attained the age of 21 may participate in this plan. The Company may make a Qualified Discretionary Contribution, as defined in the plan, or provide matching contributions to this plan. Effective July 1, 2007, the Company amended this plan to change the service requirement to 60 days and provided for matching contribution to the plan at 50% of the employee’s contribution up to a maximum employer contribution of 3% of the employee’s annual compensation.

The second plan is for the Company’s pilots, and contained the same service requirements as the first plan and was amended effective July 1, 2007, to change the service requirements to 60 days and having attained the age of 21. The Company matches 100% of the pilot’s contribution, up to 8% of the individual pilot’s annual compensation. Both the first and the second plans are subject to the annual IRS elective deferral limit, which was $17 thousand for 2012.

The third plan is for all Company employees residing in Puerto Rico and was adopted on April 16, 2012. It contains the same amended service requirements as the first and second plans. For pilots participating in the Puerto Rico plan, the Company matches 100% of their contribution, up to 8% of the individual pilot's annual compensation, but subject to the annual Puerto Rico pre-tax elective deferral limit, which was $13 thousand for 2012. For all other employees participating in the Puerto Rico plan, the Company provides for matching contribution to the plan at 50% of the employee's contribution up to a maximum employer contribution of 3% of the employee's annual compensation.

Matching contributions made to all plans were $6.6 million , $4.9 million and $4.8 million in 2012, 2011 and 2010, respectively, and were included within salaries, wages and benefits in the accompanying statements of operations.

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Net Income per Share

12 Months Ended

Dec. 31, 2012

Earnings Per Share [Abstract]

Net Income per Share

Net Income per Share

The following table sets forth the computation of basic and diluted earnings per common share:

	Year Ended December 31,
	2012		2011		2010
	(in thousands, except for share and per share amounts)
Numerator
Net income	$	108,460	$	76,448	$	72,481
Denominator
Weighted-average shares outstanding, basic	72,386		53,241		26,184
Effect of dilutive stock awards	205		274		506
Adjusted weighted-average shares outstanding, diluted	72,591		53,515		26,690
Net Income per Share
Basic earnings per common share	$	1.50	$	1.44	$	2.77
Diluted earnings per common share	$	1.49	$	1.43	$	2.72

As of December 31, 2012, there were 88 thousand anti-dilutive stock awards excluded from the computation of diluted earnings per common share. As of December 31, 2011, there were 70 thousand anti-dilutive awards excluded from the computation of diluted earnings per common share.

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Financial Instruments and Risk Management (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Investments, All Other Investments [Abstract]
Into-plane fuel cost	$ 471,542	$ 392,278	$ 251,754
Settlement losses (gains)	175	(7,436)	(1,483)
Unrealized mark-to-market losses (gains)	46	3,204	(2,065)
Aircraft fuel	$ 471,763	$ 388,046	$ 248,206
Fuel
Derivative [Line Items]
Nonmonetary notional amount (in units)	7,800,000	13,450,000
Nonmonetary notional amount, percent of required need, coverage, remaining fiscal year	5.00%	9.00%
Weighted average ceiling price (in dollars per unit)	3.09	2.99
Weighted average floor price (in dollars per unit)	2.84	2.81

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Common Stock and Preferred Stock

12 Months Ended

Dec. 31, 2012

Stockholders' Equity Note [Abstract]

Common Stock and Preferred Stock

Common Stock and Preferred Stock

The Company’s amended and restated certificate of incorporation dated June 1, 2011, authorizes the Company to issue up to 240,000,000 shares of common stock, $0.0001 par value per share, 50,000,000 shares of non-voting common stock, $0.0001 par value per share, and 10,000,000 shares of preferred stock, $0.0001 par value per share. All of the Company’s issued and outstanding shares of common stock and preferred stock are duly authorized, validly issued, fully paid and non-assessable. The Company’s shares of common stock and non-voting common stock are not redeemable and do not have preemptive rights.

Common Stock

Dividend Rights. Holders of the Company’s common stock are entitled to receive dividends, if any, as may be declared from time to time by the Company’s board of directors out of legally available funds ratably with shares of the Company’s non-voting common stock, subject to preferences that may be applicable to any then outstanding preferred stock and limitations under Delaware law.

Voting Rights. Each holder of the Company’s common stock is entitled to one vote for each share on all matters submitted to a vote of the stockholders, including the election of directors. The Company’s stockholders do not have cumulative voting rights in the election of directors. Accordingly, holders of a majority of the voting shares are able to elect all of the directors properly up for election at any given stockholders’ meeting.

Liquidation. In the event of the Company’s liquidation, dissolution or winding up, holders of the Company's common stock will be entitled to share ratably with shares of the Company’s non-voting common stock in the net assets legally available for distribution to stockholders after the payment of all of the Company’s debts and other liabilities and the satisfaction of any liquidation preference granted to the holders of any then outstanding shares of preferred stock.

Rights and Preferences. Holders of the Company’s common stock have no preemptive, conversion, subscription or other rights, and there are no redemption or sinking fund provisions applicable to the Company’s common stock. The rights, preferences and privileges of the holders of the Company’s common stock are subject to and may be adversely affected by, the rights of the holders of shares of any series of the Company’s preferred stock that the Company may designate in the future.

Non-Voting Common Stock

Dividend Rights. Holders of the Company’s non-voting common stock are entitled to receive dividends, if any, as may be declared from time to time by the Company’s board of directors out of legally available funds ratably with shares of the Company’s common stock, subject to preferences that may be applicable to any then outstanding preferred stock and limitations under Delaware law.

Voting Rights. Shares of the Company’s non-voting common stock are not entitled to vote on any matters submitted to a vote of the stockholders, including the election of directors, except to the extent required under Delaware law.

Conversion Rights. Shares of the Company’s non-voting common stock will be convertible on a share-for-share basis into common stock at the election of the holder subject to the Company remaining in compliance with applicable foreign ownership limitations.

Liquidation. In the event of the Company’s liquidation, dissolution or winding up, holders of the Company’s non-voting common stock will be entitled to share ratably with shares of the Company’s common stock in the net assets legally available for distribution to stockholders after the payment of all of the Company’s debts and other liabilities and the satisfaction of any liquidation preference granted to the holders of any then outstanding shares of preferred stock.

Rights and Preferences. Holders of the Company’s non-voting common stock have no preemptive, subscription or other rights, and there are no redemption or sinking fund provisions applicable to the Company’s common stock. The rights, preferences and privileges of the holders of the Company’s common stock are subject to and may be adversely affected by, the rights of the holders of shares of any series of the Company’s preferred stock that the Company may designate in the future.

On December 7, 2011, the Company entered into a Stock Distribution Agreement with Indigo Miramar LLC and its members. Pursuant to the Stock Distribution Agreement 10,576,180 shares of outstanding common stock were exchanged on a share-for-share basis for shares of non-voting common stock. As of December 31, 2012, the number of outstanding non-voting common stock had decreased to 1,669,205. In February 2013, all of the remaining outstanding shares of non-voting common stock were converted to voting shares in accordance with the Stock Distribution Agreement.

Preferred Stock

The Company’s board of directors has the authority, without further action by the Company’s stockholders, to issue up to 10,000,000 shares of preferred stock in one or more series and to fix the rights, preferences, privileges and restrictions thereof. These rights, preferences and privileges could include dividend rights, conversion rights, voting rights, terms of redemption, liquidation preferences, sinking fund terms and the number of shares constituting any series or the designation of such series, any or all of which may be greater than the rights of common stock. The Company’s issuance of preferred stock could adversely affect the voting power of holders of common stock and the likelihood that such holders will receive dividend payments and payments upon liquidation. In addition, the issuance of preferred stock could have the effect of delaying, deferring or preventing a change of control of the Company or other corporate action. As of December 31, 2012 and 2011, there were no shares of preferred stock outstanding.

Prior to the Company’s IPO and related recapitalization on June 1, 2011, there were issued and outstanding 100,000 shares of Class A preferred stock, 2,850 shares of Class B preferred stock, 20,848,847 shares of Class A common stock and 5,964,489 shares of Class B common stock. In the recapitalization consummated on June 1, 2011, all shares of preferred stock and all notes not repaid with the net proceeds received by the Company in the IPO were exchanged for shares of common stock in accordance with the Recapitalization Agreement. In addition, each share of Class B common stock was exchanged for one share of common stock. See Note 18.

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Stock-Based Compensation

12 Months Ended

Dec. 31, 2012

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-Based Compensation

Stock-Based Compensation

The Company has stock plans under which directors, officers, key employees, and consultants of the Company may be granted restricted stock awards, stock options and other equity-based instruments as a means of promoting the Company’s long-term growth and profitability. The plans are intended to encourage participants to contribute to and participate in the success of the Company.

The Company's board of directors adopted, and the Company's stockholders approved, the Amended and Restated 2005 Incentive Stock Plan, or the 2005 Stock Plan, effective January 1, 2008. The total number of shares of common stock authorized for issue pursuant to awards granted under the 2005 Stock Plan was 2,500,000 shares. The 2005 Stock Plan provided for the grant of non-qualified stock options, stock appreciation rights, restricted stock, performance shares, phantom stock, restricted stock units and other awards that are valued in whole or in part by reference to the Company's stock.

On May 9, 2011, the Company's board of directors adopted, and the Company's stockholders approved, the 2011 Equity Incentive Award Plan, or 2011 Plan. Under the 2011 Plan, 3,000,000 new shares of common stock are reserved for issuance pursuant to a variety of stock-based compensation awards, including stock options, stock appreciation rights or SARs, restricted stock awards, restricted stock unit awards, deferred stock awards, dividend equivalent awards, stock payment awards and performance share awards and other stock-based awards, plus the number of shares remaining available for future awards under our 2005 Stock Plan. The number of shares reserved for issuance or transfer pursuant to awards under the 2011 Plan will be increased by the number of shares represented by awards outstanding under the Company's 2005 Stock Plan that are forfeited or lapse unexercised and which, following the effective date of the 2011 Plan, are not issued under the Company's 2005 Stock Plan. No further awards will be granted under the 2005 Stock Plan, and all outstanding awards will continue to be governed by their existing terms. As of December 31, 2012 and December 31, 2011, 2,689,490 and 3,336,614 shares of the Company’s common stock, respectively, remained available for future issuance under the 2011 Plan.

Restricted stock and restricted stock unit awards are valued at the fair value of the shares on the date of grant if vesting is based on a service or a performance condition. Granted shares and units vest 25% per year on each anniversary of issuance. Each restricted stock unit represents the right to receive one share of common stock upon vesting of such restricted stock unit. Compensation expense is recognized on a straight-line basis over the requisite service period.

Stock option awards are granted with an exercise price equal to the fair market value of the Company’s common stock at the date of grant, vest over four years of continuous service, and have ten-year contractual terms. The fair value of each stock option award is estimated on the date of grant using the Black Scholes model. There were no options granted during 2012. For option grants during 2011, the Company’s weighted average assumptions for expected volatility, dividends, term, and risk-free interest rate were 46.25%, 0%, 6.25 years and 2.03%, respectively. For option grants during 2010, the Company’s weighted average assumptions for expected volatility, dividends, term, and risk-free interest rate were 51.6%, 0%, 6.25 years and 2.12%, respectively. Expected volatilities are based on the historical volatility of a group of peer entities within the same industry. The expected term of options is based upon the simplified method, which represents the average of the vesting term and the contractual term. The risk-free interest rate is based on U.S. Treasury yields for securities with terms approximating the expected term of the option.

Prior to the Company's IPO, to the extent a market price was not available, the fair value of the Company’s common stock was estimated using a discounted cash flow analysis and market multiples, based on management’s estimates of revenue, driven by assumed market growth rates, and estimated costs as well as appropriate discount rates. These estimates are consistent with the plans and estimates management uses to manage the Company’s business. Share-based compensation cost is included within salaries, wages and benefits in operating expenses in the accompanying statements of operations and amounted to $4.3 million, $0.5 million and $0.6 million for 2012, 2011, and 2010 respectively. During 2012, 2011, and 2010, there was $1.6 million, $0.2 million and $0.4 million tax benefit recognized in income, respectively.

A summary of share option activity under the 2011 Plan as of December 31, 2012 and changes during the year endedDecember 31, 2012 is presented below:

	Number of Shares		Weighted- Average Exercise Price ($)	Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value ($000)
Outstanding at December 31, 2011	312,000		9.33	8.9	1,946
Exercised	(57,725	)	8.16
Forfeited or expired	(6,625	)	9.74
Outstanding at December 31, 2012	247,650		9.59	8.0	2,015
Exercisable at December 31, 2012	70,900		9.29	7.9	598
Vested or Expected to Vest at December 31, 2012	238,932		9.56	8.0	1,951

There were no options granted during the year ended December 31, 2012. The weighted-average fair value of option awards granted during the years ended December 31, 2011 and 2010 was $5.73, and $4.06, respectively. The total intrinsic value of share options exercised during the years ended December 31, 2012 and 2011 was $0.7 million and $0.2 million, respectively. There were no options exercised during the year ended December 31, 2010. The total fair value of shares vested during the years ended December 31, 2012, 2011 and 2010 was $0.4 million, $0.3 million and $0.2 million, respectively.

A summary of the status of the Company’s restricted stock shares (restricted stock awards and restricted stock unit awards) as of December 31, 2012 and changes during the year endedDecember 31, 2012 is presented below:

	Number of Shares		Weighted-Average Grant Date Fair Value ($)
Outstanding at December 31, 2011	271,999		1.43
Granted	391,418		20.01
Vested	(197,613	)	2.67
Forfeited	(16,175	)	4.79
Outstanding at December 31, 2012	449,629		16.94

The weighted-average fair value of restricted stock granted during the years ended December 31, 2012 and 2010 was $20.01 and $6.39, respectively. There was no restricted stock granted during the year ended December 31, 2011. The total fair value of restricted stock shares vested during the years ended December 31, 2012, 2011 and 2010 was $3.9 million, $3.2 million, and $2.2 million respectively.

As of December 31, 2012 and December 31, 2011, there was $6.8 million and $1.3 million, respectively, of total unrecognized compensation cost related to nonvested restricted stock and options expected to be recognized over a weighted-average period of 3.1 years and 2.6 years, respectively.

Performance Share Awards

During 2012, the Company granted certain senior-level executives restricted stock units that vest based on market and service conditions as part of a long-term incentive plan, which are referred to herein as performance share awards. The number of shares of common stock underlying each award is determined at the end of a three-year performance period. In order to vest, the senior level executive must still be employed by the Company, with certain contractual exclusions, at the end of the performance period. At the end of the performance period, the percentage of the stock units that will vest will be determined by ranking the Company’s total shareholder return compared to the total shareholder return of 12 peer companies. Based on the level of performance, between 0% and 200% of the award may vest. Within 60 days after vesting, the shares underlying the award will be issued to the participant. In the event of a change in control of the Company or the disability or death of a participant, the payout of any award is limited to a pro-rated portion of such award based upon a performance assessment prior to the change-in-control date or date of disability or death.

The market condition requirements are reflected in the grant date fair value of the award, and the compensation expense for the award will be recognized assuming that the requisite service is rendered regardless of whether the market conditions are achieved.

The grant date fair value of the performance share awards was determined through the use of a Monte Carlo simulation model, which utilizes multiple input variables that determine the probability of satisfying the market condition requirements applicable to each award as follows:

	Weighted-Average at Grant Date
Expected volatility factor	0.39
Risk free interest rate	0.44	%
Expected term (in years)	2.72
Expected dividend yield	—	%

At the time of the performance share award grants, the Company had been public for less than one year; as such, the volatility was based upon a weighted average of the volatility for the Company and the most recent volatility of its peers. The peer group used to calculate volatility is consistent with the group used for the traditional employee stock options. The Company chose to use historical volatility to value these awards because historical stock prices were used to develop the correlation coefficients between the Company and each of the peer companies within the peer group in order to model stock price movements. The volatilities used were calculated over the most recent period, which was the remaining term of the performance period at the date of grant. The risk-free interest rate was based on the implied yield available on U.S. Treasury zero-coupon issues with remaining terms equivalent to the remaining performance period. The Company does not intend to pay dividends on its common stock in the foreseeable future. Accordingly, the Company used a dividend yield of zero in its model.

The following table summarizes the Company’s performance share awards for the year endedDecember 31, 2012:

	Number of Awards	Weighted-Average Fair Value at Grant Date ($)
Outstanding at December 31, 2011	—	—
Granted	280,907	20.30
Vested	—	—
Forfeited	—	—
Outstanding at December 31, 2012	280,907	20.30

As of December 31, 2012, there was $6.9 million of total unrecognized compensation cost related to performance share awards. The unrecognized cost is expected to be recognized over two years.

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Debt, Related-Party Transactions and Other Obligations

12 Months Ended

Dec. 31, 2012

Debt and Related Party Transactions Disclosure [Abstract]

Debt, Related-Party Transactions and Other Obligations

Debt, Related-Party Transactions and Other Obligations

In connection with the closing of the IPO, the Company consummated the transaction contemplated by the Recapitalization Agreement on June 1, 2011, which resulted in the repayment or exchange for common stock of all of the Company’s notes and preferred stock. See Note 18. As of December 31, 2012 and 2011, there was no outstanding long term debt, long term obligations or outstanding amounts due to related parties.

The Company has a line of credit for $18.6 million and $8.6 million related to corporate credit cards, of which the Company had drawn $3.2 million and $2.4 million as of December 31, 2012 and 2011, respectively.

In addition, the Company has lines of credit with counterparties to the Company's jet fuel derivatives in the amount of $18.0 million as of December 31, 2012. Of the $18.0 million in lines of credit, $5.0 million is provided exclusively for jet fuel derivatives, $10.0 million is provided exclusively for physical fuel delivery, and the remaining $3.0 million is provided for either purpose. As of December 31, 2012, the Company had drawn $11.2 million for physical fuel delivery and had not drawn on the remaining lines. As of December 31, 2011, the Company had lines of credit with counterparties in the amount of $8 million exclusively for jet fuel derivatives. As of December 31, 2011, the Company had not drawn on the lines of credit. The Company is required to post collateral for any excess above the lines of credit if the derivatives are in a net liability position and make periodic payments in order to maintain an adequate undrawn portion for physical fuel delivery.

The Company’s principal stockholders provided certain consulting services to the Company for a management fee of $0.8 million in 2010. For the year ended December 31, 2011, the Company expensed $0.3 million related to these consulting services. There were no management fees paid in 2012.

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Income Taxes - Deferred Taxes (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred tax assets:
Net operating loss	$ 83	$ 6,234
Deferred loss	0	1,440
Deferred revenue	5,829	5,985
Federal tax credits	0	3,176
Nondeductible accruals	6,744	5,452
Other	1,072	306
Gross deferred tax assets	13,728	22,593
Deferred tax assets, net	13,728	22,593
Deferred tax liabilities:
Capitalized interest	(1,125)	(2,041)
Deferred gain	(364)	0
Fuel hedging	(97)	(115)
Accrued engine maintenance	(29,497)	(10,232)
Property, plant, and equipment	(3,271)	(1,575)
Gross deferred tax liabilities	34,354	13,963
Net deferred tax assets (liabilities)	(20,626)	8,630
Assets:
Other current assets	12,591	20,738
Liabilities:
Other long-term liabilities	$ (33,216)	$ (12,108)

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Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2012	Dec. 31, 2012 aircraft_engine
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of spare aircraft engines ordered		3
Cash payment including interest to pre-IPO stockholders pursuant to tax receivable agreement	$ 27.2
Interest included in cash payment to pre-IPO stockholders pursuant to tax receivable agreement	0.3
Aircraft and Related Flight Equipment
Unrecorded Unconditional Purchase Obligation [Line Items]
Committed expenditures, 2013		323.0
Committed expenditures, 2014		354.0
Committed expenditures, 2015		523.0
Committed expenditures, 2016		505.0
Committed expenditures, 2017		613.0
Committed expenditures, 2018 and beyond		2,339.0
Reservation System Provider
Unrecorded Unconditional Purchase Obligation [Line Items]
Committed expenditures, 2013		3.1
Committed expenditures, 2014		3.7
Committed expenditures, 2015		3.7
Committed expenditures, 2016		3.7
Committed expenditures, 2017		3.7
Committed expenditures, 2018 and beyond		2.5
Airbus A320
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of aircraft ordered (in aircraft)		106
Airbus used A319 aircraft
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of aircraft ordered (in aircraft)		2
Airbus A320 current model
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of aircraft ordered (in aircraft)		54
Airbus A320 Neo
Unrecorded Unconditional Purchase Obligation [Line Items]
Number of aircraft ordered (in aircraft)		50

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Income Taxes - Income Tax Reconciliation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation of Income Tax Expense
Expected provision at federal statutory tax rate	$ 61,104	$ 42,991	$ 7,062
State and foreign tax expense, net of federal benefit	3,726	2,255	413
Interest and dividend on preferred stock	0	710	1,612
Change in valuation allowance	0	0	(65,248)
Meals and entertainment	649	469	315
Fines and penalties	84	(36)	9
Federal credits	0	(103)	(156)
Adjustment to deferred tax assets and liabilities	(3)	(3)	3,486
Other	564	100	211
Total income tax expense (benefit)	$ 66,124	$ 46,383	$ (52,296)

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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2012

Fair Value Disclosures [Abstract]

Assets and liabilities measured at fair value on a recurring basis

Assets and liabilities measured at fair value on a recurring basis are summarized below:

	Fair Value Measurements as of December 31, 2012
	Total		Level 1		Level 2		Level 3
	(in millions)
Cash and cash equivalents	$	416.8	$	416.8	$	—	$	—
Option contracts	0.3		—		—		0.3
Total assets	$	417.1	$	416.8	$	—	$	0.3
Total liabilities	$	—	$	—	$	—	$	—

	Fair Value Measurements as of December 31, 2011
	Total		Level 1		Level 2		Level 3
	(in millions)
Cash and cash equivalents	$	343.3	$	343.3	$	—	$	—
Option contracts	1.0		—		—		1.0
Total assets	$	344.3	$	343.3	$	—	$	1.0
Option contracts	0.7		$	—	$	—	$	0.7
Total liabilities	$	0.7	$	—	$	—	$	0.7

Assets and liabilities measured at fair value on a recuring basis using significant unobservable inputs (Level 3)

The following table presents the Company’s activity for assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3):

	Fuel Derivatives
	(in millions)
Balance at January 1, 2010	$	1.4
Total realized or unrealized gains (losses) included in earnings, net	3.5
Settlements, net	(1.4		)
Balance at December 31, 2010	3.5
Total realized or unrealized gains (losses) included in earnings, net	4.2
Settlements, net	(7.4		)
Balance at December 31, 2011	0.3
Total realized or unrealized gains (losses) included in earnings, net	(0.2		)
Settlements, net	0.2
Balance at December 31, 2012	$	0.3

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Stock-Based Compensation - Performance Share Awards (Details) (Performance Share Awards, USD $)	12 Months Ended
	Dec. 31, 2012
Performance Share Awards
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding, beginning of period (in shares)	0
Granted (in shares)	280,907
Vested (in shares)	0
Forfeited (in shares)	0
Outstanding, end of period (in shares)	280,907
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Outstanding, weighted-average grant date fair value, beginning of period (in dollars per share)	$ 0
Granted, weighted-average grant date fair value (in dollars per share)	$ 20.30
Vested, weighted-average grant date fair value (in dollars per share)	$ 0
Forfeited, weighted-average grant date fair value (in dollars per share)	$ 0
Outstanding, weighted-average grant date fair value, end of period (in dollars per share)	$ 20.30

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Commitments and Contingencies

12 Months Ended

Dec. 31, 2012

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Aircraft-Related Commitments and Financing Arrangements

The Company’s contractual purchase commitments consist primarily of aircraft and engine acquisitions through manufacturers and aircraft leasing companies. As of December 31, 2012, firm aircraft orders with Airbus and a third party consisted of 106 A320 family aircraft (two used A319 aircraft, 54 of the existing A320 aircraft model and 50 A320 NEOs) and engine orders with International Aero Engines consisted of three spare V2500 IAE International Aero Engines AG engines. Aircraft are scheduled for delivery from 2013 through 2021, and spare engines are scheduled for delivery from 2013 through 2015. Committed expenditures for these aircraft and related flight equipment, including estimated amounts for contractual price escalations and pre-delivery payments, will be approximately $323 million in 2013, $354 million in 2014, $523 million in 2015, $505 million in 2016, $613 million in 2017 and $2,339 million in 2018 and beyond.

Litigation

The Company is subject to commercial litigation claims and to administrative and regulatory proceedings and reviews that may be asserted or maintained from time to time. The Company believes the ultimate outcome of such lawsuits, proceedings and reviews will not, individually or in the aggregate, have a material adverse effect on its financial position, liquidity or results of operations.

Employees

The Company has three union-represented employee groups that together represent approximately 54% of all employees at December 31, 2012 and 52% of all employees at December 31, 2011. The table below sets forth the Company's employee groups and status of the collective bargaining agreements.

Employee Groups	Representative	Amendable Date
Pilots	Air Line Pilots Association, International (ALPA)	August 2015
Flight Attendants	Association of Flight Attendants (AFA-CWA)	August 2007
Dispatchers	Transport Workers Union (TWU)	July 2012

The collective bargaining agreement between the Company and the Company’s pilots represents 22% of the Company’s employees as of December 31, 2012.

The collective bargaining agreement between the Company and the Company’s flight attendants represents approximately 31% of the Company’s employees as of December 31, 2012. The Company and the AFA-CWA are currently in negotiations to reach a new collective bargaining agreement.

The collective bargaining agreement between the Company and its dispatchers represents approximately 1% of the Company’s employees as of December 31, 2012.

The Company is self-insured for health care claims for eligible participating employees and qualified dependent medical claims, subject to deductibles and limitations. The Company’s liabilities for claims incurred but not reported are determined based on an estimate of the ultimate aggregate liability for claims incurred. The estimate is calculated from actual claim rates and adjusted periodically as necessary. The Company has accrued $1.9 million, $2.0 million, and $2.1 million for health care claims as of December 31, 2012, 2011 and 2010, respectively.

Other

The Company is contractually obligated to pay the following minimum guaranteed payments to the provider of its reservation system as of December 31, 2012: $3.1 million in 2013, $3.7 million in 2014, $3.7 million in 2015, $3.7 million in 2016, $3.7 million in 2017 and $2.5 million in 2018 and thereafter.

The Company entered into a Tax Receivable Agreement (“TRA”) with the Company's Pre-IPO Stockholders (as defined in the TRA) that became effective immediately prior to the consummation of the IPO. In accordance with the TRA, the Company paid $27.2 million, including $0.3 million of applicable interest, in the second quarter of 2012. See Note 18.

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Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2012

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation

Spirit Airlines, Inc. (Spirit or the Company) headquartered in Miramar, Florida, is an ultra low-cost, low-fare airline that provides affordable travel opportunities principally throughout the domestic United States, the Caribbean and Latin America. The Company manages operations on a system-wide basis due to the interdependence of its route structure in the various markets served. As only one service is offered (i.e., air transportation), management has concluded that there is only one reportable segment.

Certain prior period amounts have been reclassified to conform to the current year's presentation.

Use of Estimates

Use of Estimates

The preparation of financial statements in conformity with generally accepted accounting principles in the United States of America requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from these estimates.

Cash and Cash Equivalents

Cash and Cash Equivalents

The Company considers all highly liquid investments with maturities of less than three months at the date of acquisition to be cash equivalents. Investments included in this category primarily consist of money market funds.

Restricted Cash

Restricted Cash

Restricted cash primarily consists of funds held by credit card processors as collateral for future travel paid with a credit card.

Accounts Receivable

Accounts Receivable

Accounts receivable primarily consist of amounts due from credit card processors associated with the sales of tickets and amounts due from counterparties associated with fuel derivative instruments that have settled. The allowance for doubtful accounts was immaterial as of December 31, 2012, 2011 and 2010.

In addition, the provision for doubtful accounts and write-offs for 2012, 2011 and 2010 were each immaterial

Deferred Offering Costs

Deferred Offering Costs

The Company complies with the requirements of SEC Staff Accounting Bulletin (SAB) Topic 5A—“Expenses of Offering.” Deferred offering costs consisted principally of legal, accounting, printing, and underwriting fees related to the Company's initial public offering (the IPO). A total of $6.1 million in deferred offering costs were charged to additional paid-in capital net of proceeds in connection with the consummation of the IPO in 2011.

Property and Equipment

Property and Equipment

Property and equipment are stated at cost, less accumulated depreciation and amortization. Depreciation of operating property and equipment is computed using the straight-line method applied to each unit of property, except on flight equipment (major rotable parts, avionics, and assemblies), which are depreciated on a group basis over the average life of the applicable equipment. During 2012, the Company wrote off approximately $15.3 million in fully depreciated and out-of-service assets and recorded a corresponding entry to accumulated depreciation.

The depreciable lives used for the principal depreciable asset classifications are:

	Estimated Useful Life
Spare rotables and flight assemblies	Lesser of the useful life of equipment or average remaining fleet life
Other equipment and vehicles	5 to 7 years
Internal use software	3 to 10 years

All aircraft and spare engines are financed through operating leases with terms of 3 to 12 years for aircraft and 7 to 12 years for spare engines. Residual values for major spare rotable parts, avionics, and assemblies are estimated to be 10%.

The following table illustrates the components of depreciation and amortization expense:

	Year Ended December 31,
	2012		2011		2010
	(in thousands)
Depreciation	$	6,156	$	5,186	$	4,313
Amortization of heavy maintenance	9,100		2,574		1,307
Total depreciation and amortization	$	15,256	$	7,760	$	5,620

The Company capitalizes certain internal and external costs associated with the acquisition and development of internal use software for new products, and enhancements to existing products that have reached the application development stage and meet recoverability tests. Capitalized costs include external direct costs of materials and services utilized in developing or obtaining internal-use software, and labor cost for employees who are directly associated with and devote time to internal-use software projects. These costs are included in property and equipment.

Amortization of capitalized software development costs is charged to depreciation on a straight-line method basis. Amortization of capitalized software development costs was $3.2 million, $2.0 million, and $1.1 million for the years ended 2012, 2011, and 2010, respectively. The Company capitalized $2.3 million, $3.3 million, and $2.4 million, of software development costs during the years ended 2012, 2011, and 2010, respectively.

Measurement of Asset Impairments

Measurement of Asset Impairments

The Company records impairment charges on long-lived assets used in operations when events and circumstances indicate that the assets may be impaired, the undiscounted cash flows estimated to be generated by those assets are less than the carrying amount of those assets, and the net book value of the assets exceeds their estimated fair value. In making these determinations, the Company uses certain assumptions, including, but not limited to: (i) estimated fair value of the assets; and (ii) estimated, undiscounted future cash flows expected to be generated by these assets, which are based on additional assumptions such as asset utilization, length of service the asset will be used in the Company’s operations, and estimated salvage values.

Capitalized Interest

Capitalized Interest

Interest attributable to funds used to finance the acquisition of new aircraft is capitalized as an additional cost of the related asset. Capitalization of interest ceases when the asset is no longer being prepared for its intended use or is ready for service.

Passenger Revenue Recognition

Passenger Revenue Recognition

Tickets sold are initially deferred as “air traffic liability.” Passenger revenue is recognized at time of departure when transportation is provided. A nonrefundable ticket expires at the date of scheduled travel and is recognized as revenue at the date of scheduled travel.

Customers may elect to change their itinerary prior to the date of departure. A service charge is assessed and recognized on the date the change is initiated and is deducted from the face value of the original purchase price of the ticket, and the original ticket becomes invalid. The amount remaining after deducting the service charge is called a credit shell which expires 60 days from the date the credit shell is created and can be used towards the purchase of a new ticket and the Company’s other service offerings. The amount of credits expected to expire is recognized as revenue upon issuance of the credit and is estimated based on historical experience. Estimating the amount of credits that will go unused involves some level of subjectivity and judgment.

The Company is also required to collect certain taxes and fees from customers on behalf of government agencies and airports and remit these back to the applicable governmental entity or airport on a periodic basis. These taxes and fees include U.S. federal transportation taxes, federal security charges, airport passenger facility charges, and foreign arrival and departure taxes. These items are collected from customers at the time they purchase their tickets, but are not included in passenger revenue. The Company records a liability upon collection from the customer and relieves the liability when payments are remitted to the applicable governmental agency or airport.

Frequent Flier Program

Frequent Flier Program

Flown Miles. The Company records a liability for mileage credits earned by passengers, including mileage credits for members with an insufficient number of mileage credits to earn an award, under its FREE SPIRIT program based on the estimated incremental cost of providing free travel for credits that are expected to be redeemed. Incremental costs include fuel, insurance, security, ticketing, and facility charges reduced by an estimate of fees required to be paid by the passenger when redeeming the award.

Original Affinity Card Program. The Company also sells mileage credits to companies participating in the FREE SPIRIT program (or affinity card program). Under the original affinity card program, funds received from the sale of mileage credits were accounted for as a multiple element arrangement and allocated to a marketing component and a transportation component (mileage credits) using the residual method. The fair value of the transportation component was deferred and recognized ratably as passenger revenue over the estimated period the transportation was expected to be provided which was estimated at 16 months. The difference between the funds received and the fair value of the transportation component was recognized in non-ticket revenue at the time of sale as non-ticket marketing revenue. The marketing component represented the Company’s compensation for use of its trademark, customer lists and placement of marketing materials to encourage application for credit cards. Because there were no undelivered elements other than the mileage credits, the Company recorded the revenue from the marketing component when funds were received. The Company also received bonuses from companies participating in the FREE SPIRIT program that are driven by the volume of the usage of the Company’s co-branded credit cards. The Company recognized these bonuses as non-ticket revenue when payment was received (milestone method) as the milestones are substantive.

During the fourth quarter of 2010, the Company determined not to renew its agreement with the administrator of the FREE SPIRIT affinity credit card program at the scheduled expiration in February 2011. In connection with that non-renewal, the Company entered into an agreement with the former administrator regarding the transition of the program to a new provider and the remittance to the Company of compensation due to the Company for card members obtained through the Company’s marketing services in the amount of $5.0 million, of which $4.6 million was recognized in the fourth quarter of 2010 and $0.4 million was recognized in the first quarter of 2011.

New Affinity Card Program. The Company entered into a new affinity card program that became effective April 1, 2011. The agreement calls for the marketing of a co-branded Spirit credit card and the delivery of award miles over the five-year contract term. At the inception of the arrangement, the Company evaluated all deliverables in the arrangement to determine whether they represent separate units of accounting using the criteria as set forth in ASU No. 2009-13. The Company determined the arrangement had three separate units of accounting: (i) travel miles to be awarded, (ii) licensing of brand and access to member lists, and (iii) advertising and marketing efforts. Under ASU No. 2009-13, arrangement consideration should be allocated based on relative selling price. At inception of the arrangement, the Company established the relative selling price for all deliverables that qualified for separation. The manner in which the selling price was established was based on a hierarchy of evidence that the Company considered. Total arrangement consideration was then allocated to each deliverable on the basis of the deliverable’s relative selling price. In considering the hierarchy of evidence under ASU No. 2009-13, the Company first determined whether vendor specific objective evidence of selling price or third-party evidence of selling price existed. It was determined by the Company that neither vendor specific objective evidence of selling price nor third-party evidence existed due to the uniqueness of the Company’s program. As such, the Company developed its best estimate of the selling price for all deliverables. For the award miles, the Company considered a number of entity-specific factors when developing the best estimate of the selling price including the number of miles needed to redeem an award, average fare of comparable segments, breakage, restrictions, and other charges. For licensing of brand and access to member lists, the Company considered both market-specific factors and entity-specific factors including general profit margins realized in the marketplace/industry, brand power, market royalty rates, and size of customer base. For the advertising element, the Company considered market-specific factors and entity-specific factors including, the Company’s internal costs (and fluctuations of costs) of providing services, volume of marketing efforts, and overall advertising plan. Consideration allocated based on the relative selling price to both brand licensing and advertising elements is recognized as revenue when earned and recorded in non-ticket revenue. Consideration allocated to award miles is deferred and recognized ratably as passenger revenue over the estimated period the transportation is expected to be provided which is estimated at 16 months. The Company used entity-specific assumptions coupled with the various judgments necessary to determine the selling price of a deliverable in accordance with the required selling price hierarchy. Changes in these assumptions (e.g., cost of fare, number of miles to redeem awards, marketing plan, and approval rate of credit cards) could result in changes in the estimated selling prices. Determining the frequency to reassess selling price for individual deliverables requires significant judgment. Mileage credits that expire under the terms of the Company's policy or are not likely to be redeemed are collectively referred to as breakage. The Company estimates and recognizes breakage on its frequent flier miles in proportion to actual mileage redemptions, in accordance with the redemption recognition method.

The following table illustrates total cash proceeds received from the sale of mileage credits and the portion of such proceeds recognized in revenue immediately as marketing component:

	Cash proceeds from sale of miles to non-airline third parties		Portion of proceeds recognized immediately as marketing component
Year Ended	(in thousands)
December 31, 2012	$	24,938	$	20,998
December 31, 2011	20,954		16,580
December 31, 2010	20,748		10,576

The total liability for future FREE SPIRIT award redemptions and unrecognized revenue from the sale of mileage credits was $2.4 million and $3.7 million at December 31, 2012 and 2011, respectively. These balances are recorded as a component of air traffic liability in the accompanying balance sheets.

Non-ticket Revenue Recognition

Non-ticket Revenue Recognition

Non-ticket revenues are generated from air travel-related services for baggage, bookings through the Company’s call center or third-party vendors, advance seat selection, itinerary changes and loyalty programs. Non-ticket revenues also consist of services not directly related to providing transportation such as the FREE SPIRIT affinity credit card program, $9 Fare Club, and the sale of advertising to third parties on Spirit’s website and on board aircraft.

The following table summarizes the primary components of non-ticket revenue and the revenue recognition method utilized for each service or product:

		Year Ended December 31,
Non-ticket revenue	Recognition method	2012		2011		2010
		(in thousands)
Baggage	Time of departure	$	217,536	$	168,290	$	91,393
Passenger usage fee	Time of departure	149,577		71,757		47,367
Advance seat selection	Time of departure	48,956		42,112		32,512
Service charges for changes and cancellations	When itinerary is changed	27,762		25,927		23,120
Other		91,765		73,450		48,904
Non-ticket revenue		$	535,596	$	381,536	$	243,296

Charges for services recognized at time of departure are initially recorded as a liability until time of departure. The passenger usage fee is charged for tickets sold through the Company’s primary sales distribution channels, to cover the Company’s distribution costs. The primary sales distribution channels for which passenger usage fees are charged include sales through the Company’s website, sales through the third-party provided call center, and sales through travel agents; the Company does not charge a passenger usage fee for sales made at its airport ticket counters. Other non-ticket revenues include revenues from other air related charges as well as non-air related charges. Other air related charges include optional services and products provided to passengers such as on-board products, travel insurance, and use of the Company’s call center or travel agents, among others. Non-air related charges primarily consist of revenues from advertising on the Company’s aircraft and website, the Company’s $9 Fare Club subscription-based membership program, and the Company’s FREE SPIRIT affinity credit card program.

Airframe and Engine Maintenance

am.

Airframe and Engine Maintenance

The Company accounts for heavy maintenance and major overhaul and repair under the deferral method whereby the cost of heavy maintenance and major overhaul and repair is deferred and amortized based on usage through the next overhaul event.

Amortization of heavy maintenance and major overhaul costs is charged to depreciation and amortization expense and was $9.1 million , $2.6 million, and $1.3 million for the years ended 2012, 2011, and 2010, respectively. During the years ended 2012, 2011, and 2010, the Company deferred $61.6 million, $22.1 million, and $5.2 million, respectively, of costs for heavy maintenance. Accumulated heavy maintenance amortization was $14.0 million, $4.9 million, and $2.3 million for the years ended 2012 and 2011, and 2010

The Company outsources certain routine, non-heavy maintenance functions under contracts that require payment on a utilization basis, such as flight hours. Costs incurred for maintenance and repair under flight hour maintenance contracts, where labor and materials price risks have been transferred to the service provider, are expensed based on contractual payment terms. All other costs for routine maintenance of the airframes and engines are charged to expense as performed.

The table below summarizes the extent to which the Company’s maintenance costs are rate capped due to flight hour maintenance contracts:

	Year Ended December 31,
	2012		2011		2010
	(in thousands)
Flight hour-based maintenance expense	$	25,748	$	21,974	$	16,683
Non-flight hour-based maintenance expense	23,712		12,043		10,352
Total maintenance expense	$	49,460	$	34,017	$	27,035

Leased Aircraft Return Costs

Leased Aircraft Return Costs

Costs associated with returning leased aircraft are accrued when it is probable that a cash payment will be made and that amount is reasonably estimable. Any accrual is based on time remaining on the lease, planned aircraft usages, and the provisions included in the lease agreement, although the actual amount due to any lessor upon return will not be known with certainty until lease termination.

Aircraft Fuel

Aircraft Fuel

Aircraft fuel expense includes jet fuel and associated “into-plane” costs, taxes, oil, and all gains and losses associated with fuel hedge contracts.

Derivative Instruments

Derivative Instruments

The Company accounts for derivative financial instruments at fair value and recognizes them in the balance sheet in other current assets or other current liabilities. For derivatives designated as cash flow hedges, changes in fair value of the derivative are generally reported in other comprehensive income and are subsequently reclassified into earnings when the hedged item affects earnings. For the years ended 2012, 2011 and 2010, the Company did not hold derivative instruments that qualified as cash flow hedges for accounting purposes. As a result, changes in the fair value of such derivative contracts were recorded within aircraft fuel expense in the accompanying statements of operations. These amounts include both realized gains and losses and mark-to-market adjustments of the fair value of unsettled derivative instruments at the end of each period.

Advertising

Advertising

The Company expenses advertising and the production costs of advertising as incurred. Marketing and advertising expenses were $2.4 million, $2.5 million, and $4.0 million for the years ended 2012, 2011 and 2010, respectively.

Income Taxes

Income Taxes

The Company accounts for income taxes using the liability method. The Company records a valuation allowance to reduce the deferred tax assets reported if, based on the weight of the evidence, it is more likely than not that some portion or all of the deferred tax assets will be not realized.

Interest Expense

Interest Expense

Related-party interest expense incurred during 2012, 2011 and 2010 was $0.0 million, $21.0 million, and $44.6 million, respectively, and consisted primarily of paid-in-kind interest on tranche notes due to related parties and preferred stock dividends due to related parties. Non-related party interest expense during 2012, 2011 and 2010 was $1.4 million, $3.8 million and $5.7 million, respectively.

Stock-Based Compensation

Stock-Based Compensation

The Company recognizes cost of employee services received in exchange for awards of equity instruments based on the fair value of each instrument at the date of grant. Compensation expense is recognized on a straight-line basis over the period during which an employee is required to provide service in exchange for an award. The Company has issued and outstanding restricted stock awards, stock option awards, and performance share awards. Restricted stock awards are valued at the fair value of the shares on the date of grant if vesting is based on a service or a performance condition. To the extent a market price was not available, the fair value of stock awards was estimated using a discounted cash flow analysis based on management’s estimates of revenue, driven by assumed market growth rates, and estimated costs as well as appropriate discount rates. These estimates are consistent with the plans and estimates that management uses to manage the Company’s business. The fair value of share option awards is estimated on the date of grant using the Black-Scholes valuation model. The fair value of performance share awards is estimated through the use of a Monte Carlo simulation model. See Note 8 for additional information.

Concentrations of Risk

Concentrations of Risk

The Company’s business has been, and may continue to be, adversely affected by increases in the price of aircraft fuel, the volatility of the price of aircraft fuel, or both. Aircraft fuel was the Company’s single largest expenditure representing approximately 41%, 42%, and 35% of total operating expenses in 2012, 2011, and 2010, respectively.

The Company’s operations are largely concentrated in the southeast United States with Fort Lauderdale being the highest volume fueling point in the system. Gulf Coast Jet indexed fuel is the basis for a substantial majority of the Company’s fuel consumption. Any disruption to the oil production or refinery capacity in the Gulf Coast, as a result of weather or any other disaster or disruptions in supply of jet fuel, dramatic escalations in the costs of jet fuel, and/or the failure of fuel providers to perform under fuel arrangements for other reasons could have a material adverse effect on the Company’s financial condition and results of operations.

The Company’s operations will continue to be vulnerable to weather conditions (including hurricane season or snow and severe winter weather), which could disrupt service, create air traffic control problems, decrease revenue, and increase costs.

Due to the relatively small size of the fleet and high utilization rate, the unavailability of one or more aircraft and resulting reduced capacity could have a material adverse effect on the Company’s business, results of operations, and financial condition.

The Company has three union-represented employee groups that together represent approximately 54% and 52% of all employees at December 31, 2012 and 2011, respectively. A strike or other significant labor dispute with the Company’s unionized employees is likely to adversely affect the Company’s ability to conduct business. Additional disclosures are included in Note 15.

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Stock-Based Compensation - Restricted Stock Activity (Details) (Restricted Stock and Restricted Stock Units, USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Restricted Stock and Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding, beginning of period (in shares)	271,999
Granted (in shares)	391,418	0
Vested (in shares)	(197,613)
Forfeited (in shares)	(16,175)
Outstanding, end of period (in shares)	449,629	271,999
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Outstanding, weighted-average grant date fair value, beginning of period (in dollars per share)	$ 1.43
Granted, weighted-average grant date fair value (in dollars per share)	$ 20.01		$ 6.39
Vested, weighted-average grant date fair value (in dollars per share)	$ 2.67
Forfeited, weighted-average grant date fair value (in dollars per share)	$ 4.79
Outstanding, weighted-average grant date fair value, end of period (in dollars per share)	$ 16.94	$ 1.43
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Total fair value of restricted stock shares vested	$ 3.9	$ 3.2	$ 2.2

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Summary of Significant Accounting Policies - Primary Components of Non-Ticket Revenue (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Non-ticket revenue	$ 535,596	$ 381,536	$ 243,296
Baggage
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Non-ticket revenue	217,536	168,290	91,393
Passenger usage fee
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Non-ticket revenue	149,577	71,757	47,367
Advance seat selection
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Non-ticket revenue	48,956	42,112	32,512
Change fees
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Non-ticket revenue	27,762	25,927	23,120
Other
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Non-ticket revenue	$ 91,765	$ 73,450	$ 48,904

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Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating activities:
Net income	$ 108,460	$ 76,448	$ 72,481
Adjustments to reconcile net income to net cash provided by operations:
Changes in fair value of open fuel hedge contracts	46	3,204	(2,065)
Non-cash restructuring credit charges, net	0	0	22
Equity based stock compensation, net	4,327	530	569
Allowance for doubtful accounts (recoveries)	78	27	(110)
Amortization of deferred gains, losses and debt issuance costs	(830)	(1,047)	(574)
Depreciation and amortization	15,256	7,760	5,620
Deferred income tax benefit (loss)	29,255	44,180	(52,811)
Loss on disposal of assets	956	255	77
Gain on slot sale	(9,060)	0	0
Interest and dividends incurred but not paid	0	21,875	43,202
Capitalized interest	(1,350)	(2,890)	(1,491)
Changes in operating assets and liabilities:
Restricted cash	0	72,736	(20,196)
Accounts receivable	(7,393)	(5,728)	(1,014)
Prepaid maintenance reserves	(31,567)	(36,848)	(35,694)
Long-term deposits and other assets	(68,248)	(15,992)	(13,981)
Accounts payable	8,452	2,457	(2,007)
Air traffic liability	19,134	6,573	19,107
Other liabilities	46,115	(2,189)	16,132
Other	0	(153)	(234)
Net cash provided by operating activities	113,631	171,198	27,033
Investing activities:
Proceeds from sale of property and equipment	14	150	333
Proceeds from sale of slots	9,060	0	0
Pre-delivery deposits for flight equipment, net of refunds	(12,626)	(53,274)	(25,474)
Purchase of property and equipment	(23,771)	(14,093)	(5,325)
Net cash used in investing activities	(27,323)	(67,217)	(30,466)
Financing activities:
Proceeds from issuance of common stock, net offering expenses	0	170,828	0
Proceeds from options exercised	469	423	0
Payments on debt and capital lease obligations	0	(18,221)	0
Proceeds from sale leaseback transactions	12,540	4,481	0
Payments to pre-IPO shareholders pursuant to tax receivable agreement	(26,905)	0	0
Excess tax benefits from share-based compensation	2,098	0	0
Repurchase of common stock	(1,022)	(886)	0
Debt issuance costs	0	8	0
Net cash (used in) provided by financing activities	(12,820)	156,633	0
Net increase (decrease) in cash and cash equivalents	73,488	260,614	(3,433)
Cash and cash equivalents at beginning of period	343,328	82,714	86,147
Cash and cash equivalents at end of period	416,816	343,328	82,714
Supplemental disclosures
Interest	303	10,562	4,303
Taxes	40,204	1,477	562
Non-cash transactions:
Exchange of notes due to related parties for common stock	0	279,206	0
Exchange of mandatorily redeemable preferred stock for common stock	0	81,747	0
Liability and equity related to tax receivable agreement	$ (1,497)	$ 36,488	$ 0

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Letters of Credit

12 Months Ended

Dec. 31, 2012

Letters of Credit [Abstract]

Letters of Credit

Letters of Credit

In connection with agreements with certain airports, the Company is required to post letters of credit, which totaled $0.2 million as of both December 31, 2012 and 2011. The issuing banks require that the Company deposit funds at those banks to cover the amounts that could be drawn under the letters of credit. These funds are generally invested in money market accounts and are classified as long-term assets within deferred heavy maintenance and other long-term assets. Additionally, as of December 31, 2012, the Company had a $10.0 million unsecured standby letter of credit facility, representing an off balance-sheet commitment, of which $7.0 million had been drawn upon for issued letters of credit.

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Leases and Prepaid Maintenance Deposits - Sale and Leaseback Transactions (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 aircraft
Aircraft
Sale Leaseback Transaction [Line Items]
Number of sale-lease-back leases	16
Number of aircraft entered into sale leaseback agreement	7
Sale leaseback transactions on aircraft, deferred gain (loss)	$ (5.0)
Sale leaseback transaction on aircraft, refund in pre-delivery deposits	$ 40.5
Spare engines
Sale Leaseback Transaction [Line Items]
Number of sale-lease-back leases	8

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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis using Significant Unobservable Inputs (Details) (Aircraft Fuel Derivatives, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Aircraft Fuel Derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at end of period	$ 0.3	$ 0.3	$ 3.5
Balance at beginning of period	0.3	3.5	1.4
Total realized or unrealized gains (losses) included in earnings, net	(0.2)	4.2	3.5
Settlements, net	$ (0.2)	$ 7.4	$ 1.4

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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Accounting Policies [Abstract]

Depreciable lives used for the principal depreciable asset classifications

The depreciable lives used for the principal depreciable asset classifications are:

	Estimated Useful Life
Spare rotables and flight assemblies	Lesser of the useful life of equipment or average remaining fleet life
Other equipment and vehicles	5 to 7 years
Internal use software	3 to 10 years

Components of depreciation and amortization expense

The following table illustrates the components of depreciation and amortization expense:

	Year Ended December 31,
	2012		2011		2010
	(in thousands)
Depreciation	$	6,156	$	5,186	$	4,313
Amortization of heavy maintenance	9,100		2,574		1,307
Total depreciation and amortization	$	15,256	$	7,760	$	5,620

Total cash proceeds received from the sale of mileage credit

The following table illustrates total cash proceeds received from the sale of mileage credits and the portion of such proceeds recognized in revenue immediately as marketing component:

	Cash proceeds from sale of miles to non-airline third parties		Portion of proceeds recognized immediately as marketing component
Year Ended	(in thousands)
December 31, 2012	$	24,938	$	20,998
December 31, 2011	20,954		16,580
December 31, 2010	20,748		10,576

Primary components of non-ticket revenue and the revenue recognition method utilized for each service or product

The following table summarizes the primary components of non-ticket revenue and the revenue recognition method utilized for each service or product:

		Year Ended December 31,
Non-ticket revenue	Recognition method	2012		2011		2010
		(in thousands)
Baggage	Time of departure	$	217,536	$	168,290	$	91,393
Passenger usage fee	Time of departure	149,577		71,757		47,367
Advance seat selection	Time of departure	48,956		42,112		32,512
Service charges for changes and cancellations	When itinerary is changed	27,762		25,927		23,120
Other		91,765		73,450		48,904
Non-ticket revenue		$	535,596	$	381,536	$	243,296

Aircraft maintenance expense

The table below summarizes the extent to which the Company’s maintenance costs are rate capped due to flight hour maintenance contracts:

	Year Ended December 31,
	2012		2011		2010
	(in thousands)
Flight hour-based maintenance expense	$	25,748	$	21,974	$	16,683
Non-flight hour-based maintenance expense	23,712		12,043		10,352
Total maintenance expense	$	49,460	$	34,017	$	27,035

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Summary of Significant Accounting Policies - Property and Equipment (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Depreciation, Depletion and Amortization, Nonproduction [Abstract]
Depreciation	$ 6,156,000	$ 5,186,000	$ 4,313,000
Amortization of heavy maintenance	9,100,000	2,574,000	1,307,000
Total depreciation and amortization	15,256,000	7,760,000	5,620,000
Other equipment and vehicles | Minimum
Property, Plant and Equipment [Line Items]
Depreciable lives used for the principal depreciable asset classifications	5 years
Other equipment and vehicles | Maximum
Property, Plant and Equipment [Line Items]
Depreciable lives used for the principal depreciable asset classifications	7 years
Internally developed software
Depreciation, Depletion and Amortization, Nonproduction [Abstract]
Depreciation	3,200,000	2,000,000	1,100,000
Capitalized software development costs during the year	$ 2,300,000	$ 3,300,000	$ 2,400,000
Internally developed software | Minimum
Property, Plant and Equipment [Line Items]
Depreciable lives used for the principal depreciable asset classifications	3 years
Internally developed software | Maximum
Property, Plant and Equipment [Line Items]
Depreciable lives used for the principal depreciable asset classifications	10 years
Aircraft | Minimum
Property, Plant and Equipment [Line Items]
Operating leases, term	3 years
Aircraft | Maximum
Property, Plant and Equipment [Line Items]
Operating leases, term	12 years
Spare engines | Minimum
Property, Plant and Equipment [Line Items]
Operating leases, term	7 years
Spare engines | Maximum
Property, Plant and Equipment [Line Items]
Operating leases, term	12 years
Major spare rotable parts, avionics, and assemblies
Property, Plant and Equipment [Line Items]
Residual value, percentage	10.00%

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Income Taxes

12 Months Ended

Dec. 31, 2012

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

Significant components of the provision for income taxes from continuing operations are as follows:

	For the Years Ended December 31,
	2012		2011		2010
	(in thousands)
Current:
Federal	$	32,656	$	1,866	$	258
State and local	3,250		74		68
Foreign	963		263		189
Total current expense	36,869		2,203		515
Deferred:
Federal	27,870		42,148		(48,934		)
State and local	1,385		2,032		(3,877		)
Total deferred expense (benefit)	29,255		44,180		(52,811		)
Total income tax expense (benefit)	$	66,124	$	46,383	$	(52,296	)

The reconciliation of income tax expense computed at the federal statutory tax rates to income tax expense from continuing operations is as follows:

	For the Years Ended December 31,
	2012			2011			2010
	(in thousands)
Expected provision at federal statutory tax rate	$	61,104		$	42,991		$	7,062
State and foreign tax expense, net of federal benefit	3,726			2,255			413
Interest and dividend on preferred stock	—			710			1,612
Change in valuation allowance	—			—			(65,248		)
Meals and entertainment	649			469			315
Fines and penalties	84			(36		)	9
Federal credits	—			(103		)	(156		)
Adjustment to deferred tax assets and liabilities	(3		)	(3		)	3,486
Other	564			100			211
Total income tax expense (benefit)	$	66,124		$	46,383		$	(52,296	)

At December 31, 2012 and 2011, the significant components of the Company's deferred taxes consisted of the following:

	December 31,
	2012			2011
	(in thousands)
Deferred tax assets:
Net operating loss	$	83		$	6,234
Deferred loss	—			1,440
Deferred revenue	5,829			5,985
Federal tax credits	—			3,176
Nondeductible accruals	6,744			5,452
Other	1,072			306
Gross deferred tax assets	13,728			22,593
Deferred tax assets, net	13,728			22,593
Deferred tax liabilities:
Capitalized interest	(1,125		)	(2,041		)
Deferred gain	(364		)	—
Fuel hedging	(97		)	(115		)
Accrued engine maintenance	(29,497		)	(10,232		)
Property, plant, and equipment	(3,271		)	(1,575		)
Gross deferred tax liabilities	(34,354		)	(13,963		)
Net deferred tax assets (liabilities)	$	(20,626	)	$	8,630
Deferred taxes included within:
Assets:
Other current assets	$	12,591		$	20,738
Liabilities:
Other long-term liabilities	(33,216		)	(12,108		)

In assessing the realizability of the deferred tax assets, management considered whether it is more likely than not that some or all of the deferred tax assets would be realized. In evaluating the Company's ability to utilize its deferred tax assets, it considered all available evidence, both positive and negative, in determining future taxable income on a jurisdiction by jurisdiction basis.

Based on the expectation of future taxable income, the availability of reversing deferred tax liabilities, combined with achieving sustained profitability, management determined that, as of December 31, 2010, all of the Company's deferred tax assets would be realized in taxable years after 2010. Based on this determination the Company eliminated its valuation allowance, which resulted in a reduction to the valuation allowance of $65.2 million, the recognition of a deferred tax benefit of $52.8 million, and a total income tax benefit of $52.3 million for the period ending December 31, 2010.

At December 31, 2011, the Company had available for federal income tax purposes an alternative minimum tax (“AMT”) credit carryforward of approximately $3.2 million, and net operating loss (“NOL”) carryforwards for federal income tax purposes of $20.8 million. The Company's NOL carryforwards at December 31, 2011 included an unrealized benefit of approximately $3.5 million related to share-based compensation that was recorded in equity during 2012. In accordance with ASC 718, excess tax benefits are only recognized in the financial statements upon actual realization of the related tax benefit, which occurred in 2012 upon utilization of the remaining NOLs and AMT credit carryforwards during the year.

The Company has fully utilized its AMT credit carryforwards of approximately $3.2 million and NOL carryforwards of approximately $20.8 million against federal taxable income as of December 31, 2012. The Company has state NOL carryforwards of approximately $2.2 million which can be used to offset future state taxable income. State net operating losses begin to expire in 2017.

During 2012 the Company recorded a foreign tax credit of $1.0 million against its 2012 federal income tax liability which was fully utilized during the year. Previously the Company deducted income taxes paid in foreign countries in arriving at federal taxable income.

On January 25, 2012, the Company experienced a subsequent ownership change under the principles of IRC §382, as a result of the secondary offering outlined in more detail in Note 3. Although the Company was subject to the limitations of IRC §382 on the utilization of its NOL and the tax credit carryforwards in 2012, the limitation was sufficiently in excess of the tax attribute carryforwards to allow complete utilization during the year.

The Company accrues interest related to unrecognized tax benefits in its provision for income taxes, and any associated penalties are recorded in selling, general and administrative expenses.

The Company files its tax returns as prescribed by the tax laws of the jurisdictions in which it operates. The Company's tax years from 2005 through 2011 are still subject to examination in the United States due to net operating loss carryovers generated in such years. Various state and foreign jurisdiction tax years remain open to examination and the Company was under examination in certain jurisdictions during 2012 the outcome of these audits were immaterial to the financial statements. The Company believes that the effect of any additional assessment(s) will be immaterial to its financial statements.