Document

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)



ý	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the quarterly period ended September 30, 2018

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

For the transition period from to

Commission File Number 001-33166

Allegiant Travel Company

(Exact Name of Registrant as Specified in Its Charter)



Nevada	20-4745737
(State or Other Jurisdiction of Incorporation or Organization)	(IRS Employer Identification No.)

1201 North Town Center Drive
Las Vegas, Nevada	89144
(Address of Principal Executive Offices)	(Zip Code)

Registrant’s Telephone Number, Including Area Code: (702) 851-7300

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 ý No o

Indicate by check mark 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 (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes ý No o

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 definitions of “large accelerated filer,” “accelerated filer,” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):



Large accelerated filer x	Accelerated filer o

Non-accelerated filer o	Smaller reporting company o

(Do not check if a smaller reporting company)	Emerging growth company o

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

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

The number of shares of the registrant’s common stock outstanding as of the close of business on October 26, 2018 was 16,159,816.

Allegiant Travel Company

Form 10-Q

Table of Contents



PART I.	FINANCIAL INFORMATION

ITEM 1.	Consolidated Financial Statements	3

ITEM 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	17

ITEM 3.	Quantitative and Qualitative Disclosures About Market Risk	28

ITEM 4.	Controls and Procedures	29

PART II.	OTHER INFORMATION

ITEM 1.	Legal Proceedings	29

ITEM 1A.	Risk Factors	29

ITEM 2.	Unregistered Sales of Equity Securities and Use of Proceeds	30

ITEM 3.	Defaults Upon Senior Securities	30

ITEM 4.	Mine Safety Disclosures	30

ITEM 5.	Other Information	30

ITEM 6.	Exhibits	31

	Signatures	32

PART I. FINANCIAL INFORMATION

Item 1. Consolidated Financial Statements

ALLEGIANT TRAVEL COMPANY

CONSOLIDATED BALANCE SHEETS

(in thousands)



	September 30, 2018			December 31, 2017
	(unaudited)
CURRENT ASSETS
Cash and cash equivalents	$	140,752		$	59,449
Restricted cash	20,317			11,190
Short-term investments	284,616			352,681
Accounts receivable	33,672			71,057
Expendable parts, supplies and fuel, net	23,790			17,647
Prepaid expenses	30,640			23,931
Other current assets	129			5,320
TOTAL CURRENT ASSETS	533,916			541,275
Property and equipment, net	1,816,805			1,512,415
Long-term investments	53,353			78,570
Deferred major maintenance, net	44,402			31,326
Deposits and other assets	32,019			16,571
TOTAL ASSETS:	$	2,480,495		$	2,180,157
CURRENT LIABILITIES
Accounts payable	$	17,299		$	20,108
Accrued liabilities	110,705			105,127
Air traffic liability	231,731			204,299
Current maturities of long-term debt and capital lease obligations, net of related costs	654,697			214,761
TOTAL CURRENT LIABILITIES	1,014,432			544,295
Long-term debt and capital lease obligations, net of current maturities and related costs	658,352			950,131
Deferred income taxes	140,555			119,013
Other noncurrent liabilities	14,160			13,407
TOTAL LIABILITIES:	1,827,499			1,626,846
SHAREHOLDERS' EQUITY
Common stock, par value $.001	23			23
Treasury stock	(607,649		)	(605,655		)
Additional paid in capital	266,907			253,840
Accumulated other comprehensive loss, net	(1,227		)	(2,840		)
Retained earnings	994,942			907,943
TOTAL EQUITY:	652,996			553,311
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY:	$	2,480,495		$	2,180,157

The accompanying notes are an integral part of these consolidated financial statements.

ALLEGIANT TRAVEL COMPANY

CONSOLIDATED STATEMENTS OF INCOME

(in thousands, except per share amounts)

(unaudited)



	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
OPERATING REVENUE:
Passenger revenue	$	355,100		$	315,308		$	1,157,443		$	1,030,395
Third party products	15,921			12,348			44,045			39,394
Fixed fee contract revenue	14,791			11,831			33,000			34,120
Other revenue	7,297			10,708			20,845			28,140
Total operating revenue	393,109			350,195			1,255,333			1,132,049
OPERATING EXPENSES:
Aircraft fuel	113,525			80,421			342,006			250,470
Salary and benefits	97,706			88,788			312,314			277,307
Station operations	43,128			37,148			122,265			107,979
Maintenance and repairs	31,983			28,870			75,864			87,611
Depreciation and amortization	34,658			31,894			92,641			92,571
Sales and marketing	16,798			13,884			54,224			40,707
Aircraft lease rentals	671			533			767			3,098
Other	28,459			24,315			74,881			68,440
Total operating expenses	366,928			305,853			1,074,962			928,183
OPERATING INCOME	26,181			44,342			180,371			203,866
OTHER (INCOME) EXPENSE:
Interest expense	14,309			10,041			40,188			27,332
Interest income	(2,425		)	(1,454		)	(6,259		)	(4,193		)
Other, net	(118		)	(400		)	(408		)	(1,254		)
Total other expense	11,766			8,187			33,521			21,885
INCOME BEFORE INCOME TAXES	14,415			36,155			146,850			181,981
PROVISION FOR INCOME TAXES	(732		)	12,771			26,494			67,208
NET INCOME	$	15,147		$	23,384		$	120,356		$	114,773
Earnings per share to common shareholders:
Basic	$	0.94		$	1.45		$	7.46		$	7.00
Diluted	$	0.94		$	1.45		$	7.45		$	6.99
Shares used for computation:
Basic	15,957			15,852			15,929			16,142
Diluted	15,962			15,862			15,938			16,160

Cash dividends declared per share:	$	0.70		$	0.70		$	2.10		$	2.10

The accompanying notes are an integral part of these consolidated financial statements.

ALLEGIANT TRAVEL COMPANY

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(in thousands)

(unaudited)



	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Net income	$	15,147		$	23,384		$	120,356		$	114,773
Other comprehensive income (loss):
Change in available for sale securities, net of tax	(83		)	230			(926		)	453
Foreign currency translation adjustments	4			(117		)	218			(416		)
Change in derivatives, net of tax	1,325			(368		)	2,321			(1,452		)
Total other comprehensive income (loss)	1,246			(255		)	1,613			(1,415		)
TOTAL COMPREHENSIVE INCOME	$	16,393		$	23,129		$	121,969		$	113,358

The accompanying notes are an integral part of these consolidated financial statements.

ALLEGIANT TRAVEL COMPANY

CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)

(unaudited)



	Nine Months Ended September 30,
	2018			2017
OPERATING ACTIVITIES:
Net income	$	120,356		$	114,773
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	92,641			92,571
(Gain) loss on aircraft and other equipment disposals	2,274			6,619
Share-based compensation expense	11,043			10,847
Deferred income taxes	21,760			64,788
Other adjustments	1,833			3,959
Changes in certain assets and liabilities:
(Increase) decrease in accounts receivable	38,005			17,709
(Increase) decrease in prepaid expenses	(6,709		)	(8,825		)
Increase (decrease) in accounts payable	(2,437		)	3,671
Increase (decrease) in accrued liabilities	5,960			(11,183		)
Increase (decrease) in air traffic liability	27,432			27,688
Change in deferred major maintenance	(21,699		)	(14,779		)
Other assets/liabilities	(336		)	(5,756		)
Net cash provided by operating activities	290,123			302,082
INVESTING ACTIVITIES:
Purchase of investment securities	(263,057		)	(273,796		)
Proceeds from maturities of investment securities	355,325			239,920
Purchase of property and equipment, including capitalized interest	(273,999		)	(333,746		)
Other investing activities	(5,399		)	1,338
Net cash used in investing activities	(187,130		)	(366,284		)
FINANCING ACTIVITIES:
Cash dividends paid to shareholders	(33,919		)	(34,462		)
Proceeds from the issuance of debt	191,724			292,540
Repurchase of common stock	(3,617		)	(90,445		)
Principal payments on debt and capital lease obligations	(171,438		)	(88,026		)
Other financing activities	4,687			(405		)
Net cash (used in) provided by financing activities	(12,563		)	79,202
Net change in cash, cash equivalents, and restricted cash	90,430			15,000
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT BEGINNING OF PERIOD	70,639			76,358
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT END OF PERIOD	$	161,069		$	91,358

SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
CASH PAYMENTS FOR:
Interest paid, net of amount capitalized	$	43,751		$	31,733
Income tax refunds	$	41,145		$	18,757

The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the consolidated balance sheets:



	As of September 30,
	2018		2017
CURRENT ASSETS:
Cash and cash equivalents	$	140,752	$	74,023
Restricted cash	20,317		17,335
TOTAL CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	$	161,069	$	91,358

The accompanying notes are an integral part of these consolidated financial statements.

ALLEGIANT TRAVEL COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(unaudited)

Note 1 — Summary of Significant Accounting Policies

Basis of Presentation

The accompanying unaudited consolidated financial statements include the accounts of Allegiant Travel Company (the “Company”) and its majority-owned operating subsidiaries. The Company has no independent operations, and all guarantees of the Company's publicly held debt are full and unconditional and joint and several. Any subsidiaries of the parent company other than the subsidiary guarantors are minor. All intercompany balances and transactions have been eliminated.

These unaudited consolidated financial statements reflect all normal recurring adjustments which management believes are necessary to present fairly the financial position, results of operations, and cash flows of the Company for the respective periods presented. Certain reclassifications have been made to prior year financial statements to conform to classifications used in the current year. Certain information and footnote disclosures normally included in the annual consolidated financial statements prepared in accordance with U.S. generally accepted accounting principles ("U.S. GAAP") have been omitted pursuant to the rules and regulations of the Securities and Exchange Commission for Form 10-Q. These unaudited interim consolidated financial statements should be read in conjunction with the audited consolidated financial statements of the Company and notes thereto included in the annual report of the Company on Form 10-K for the year ended December 31, 2017 and filed with the Securities and Exchange Commission.

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, and disclosure of contingent assets and liabilities, at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results may differ from these estimates.

Recent Accounting Pronouncements

Standards Effective in Future Years

In February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards update ("ASU") 2016-02, "Leases (topic 842)." This standard will require certain leases with durations greater than twelve months to be recognized on the balance sheet as a lease liability and a corresponding right-of-use asset, and is effective for interim and annual reporting periods beginning after December 15, 2018 with early adoption permitted. The Company will adopt this standard effective January 1, 2019.

In July 2018, the FASB issued ASU 2018-11, "Targeted Improvements - Leases (Topic 842)." This update provides an optional transition method that allows entities to elect to apply the standard prospectively at the adoption date, versus recasting the prior periods presented. If elected, the Company will recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption.

The Company has not completed the assessment of this new standard but believes adoption will have a significant impact on its consolidated balance sheets due to the recognition of right-of-use assets and lease liabilities for certain leases currently accounted for as operating leases. It is not expected to significantly change the recognition, measurement or presentation of associated expenses within the consolidated statements of income or cash flows.

Recently Adopted Standards

In February 2018, the FASB issued ASU 2018-02, "Income Statement—Reporting Comprehensive Income (Topic 220)." This standard provides an option to reclassify stranded tax effects within accumulated other comprehensive income (loss) ("AOCI") to retained earnings. The Company adopted this standard effective January 1, 2018 and a one-time effect of $0.6 million has been reclassified from AOCI to retained earnings.

In 2014, the FASB issued ASU 2014-09, "Revenue from Contracts with Customers (Topic 606)" (the "New Revenue Standard"). Under this ASU and subsequently issued amendments, revenue is recognized at the time a good or service is transferred to a customer for the amount of consideration received. Entities may use a full retrospective approach or report the cumulative effect as of the date of adoption. The Company adopted this standard using the full retrospective transition method

effective January 1, 2018 and recast prior year results. See Note 2, "Revenue Recognition" for more information on the financial impact of this adoption.

Under the New Revenue Standard, revenue for all Air-related ancillary fees that are directly related to ticket revenue, such as seat fees and baggage fees, are no longer considered distinct performance obligations separate from passenger travel and are reclassified into passenger revenue. These are deemed part of the single performance obligation of providing passenger transportation. While the adoption of the New Revenue Standard did not have a significant effect on earnings, $150.1 million and $472.4 million of Air-related ancillary fees for the three and nine months ended September 30, 2018, respectively, are now classified as passenger revenue.

The adoption of the New Revenue Standard resulted in a net reduction to air traffic liability at December 31, 2017 of $5.9 million. This change resulted from the recognition of breakage revenue on issuance of credit vouchers that are expected to expire unused. In addition, recognition of revenues for fees associated with flight changes or cancellations are now deferred until the time of flight rather than being recognized at the time the fee is incurred. The Company recognizes revenue from the co-branded credit card program on the deferral method.

Bank of America has issued The Allegiant World Mastercard® in which points are earned and awarded to cardholders in exchange for consideration received under an agreement with a seven year scheduled duration expiring in 2023. Under this arrangement, the Company identified the following deliverables: travel points to be awarded (the travel component), use of the Company’s brand and access to its member lists, and certain other advertising and marketing elements (collectively the marketing component). Consideration received from the Company’s co-brand agreement is allocated between the two components based on the relative selling price of each deliverable. The Company applies a level of management judgment and estimation in determining the best estimate of selling price for each deliverable by considering multiple inputs and methods including, but not limited to, the redemption value of points awarded, discounted cash flows, brand value, volume discounts, published selling prices, number of points to be awarded and number of points to be redeemed.

Note 2 — Revenue Recognition

Certain prior period amounts have been recast to conform to the adoption of the New Revenue Standard as shown in the tables below.



	Three Months Ended September 30, 2017							Nine Months Ended September 30, 2017
(in thousands, except per	As Previously Reported					Current Presentation		As Previously Reported					Current Presentation
share data)	As Previously Reported		Adjustments			Current Presentation		As Previously Reported		Adjustments			Current Presentation
Income Statement:
Passenger revenue (1)	$	183,064	$	132,244		$	315,308	$	615,777	$	414,618		$	1,030,395
Air-related charges	130,818		(130,818		)	—		407,789		(407,789		)	—
Sales and marketing	13,884		—			13,884		36,744		3,963			40,707
Income tax provision	12,436		335			12,771		66,715		493			67,208
Net income	22,293		1,091			23,384		112,400		2,373			114,773
Diluted earnings per share	$	1.39	$	0.06		$	1.45	$	6.85	$	0.14		$	6.99

(1) Passenger revenue previously reported as Scheduled service revenue.



	December 31, 2017
	As Previously					Current
(in thousands)	Reported		Adjustments			Presentation
Balance Sheet:
Air traffic liability	$	210,184	$	(5,885	)	$	204,299
Deferred income taxes	118,492		521			119,013
Retained earnings	902,579		5,364			907,943

Passenger Revenue

Passenger revenue is primarily composed of passenger ticket sales, credit voucher breakage, seat fees, baggage fees, and other travel-related services performed in conjunction with a passenger’s flight, as well as co-brand point redemptions as outlined below:



	Three Months Ended September 30,				Nine Months Ended September 30,
(in thousands)	2018		2017		2018		2017
Scheduled service	$	202,796	$	183,294	$	677,061	$	618,368
Ancillary air-related charges	150,095		131,388		472,443		410,500
Co-brand redemptions	2,209		626		7,939		1,527
Total passenger revenue	$	355,100	$	315,308	$	1,157,443	$	1,030,395

Scheduled service

Passenger tickets. The Company provides scheduled air transportation on limited-frequency, nonstop flights predominantly between under-served cities and popular leisure destinations. Sales of passenger tickets not yet flown are recorded in air traffic liability. Passenger revenue is recognized when transportation is provided or when ticket voucher breakage occurs, to the extent different from estimated breakage.

The contract term of passenger tickets is 12 months and revenue associated with future travel will principally be recognized within this time frame. $192.6 million was recognized into passenger revenue during the nine months ended September 30, 2018 that was recorded in the air traffic liability balance of $204.3 million at December 31, 2017.

Credit voucher breakage. The Company estimates the value of vouchers that will expire unused and recognizes such revenue at the time the credit voucher is issued.

Ancillary air-related charges

Air-related revenue is primarily composed of services performed in conjunction with a passenger's flight and includes baggage fees, the use of the Company’s website to purchase scheduled service transportation, advance seat assignments, and other services. Revenue for these services is recognized when the related transportation service is provided. Prior to the adoption of the New Revenue Standard, the majority of these fees were classified separately as Ancillary air-related charges.

Co-brand redemptions

In relation to the travel component of the contract with Bank of America, the Company has a performance obligation to provide cardholders with points to be used for future travel award redemptions. Therefore, consideration received from Bank of America related to the travel component is deferred based on its relative selling price and is recognized into passenger revenue when the points are redeemed and the transportation is provided.

The following table presents the activity of the current and non-current point liabilities (in thousands):



	2018
Balance at January 1	$	8,903
Points awarded	10,872
Points redeemed	(7,939		)
Balance at September 30	$	11,836

As of September 30, 2018, $8.1 million of the current points liability is reflected in Accrued liabilities and represents our current estimate of revenue to be recognized in the next twelve months based on historical trends, with the remaining balance reflected in Other noncurrent liabilities expected to be recognized into revenue in periods thereafter. See below, Third Party Products, for discussion of the marketing component.

Third Party Products

Third party products revenue is generated from the sale of hotel rooms, rental cars, ticket attractions and co-brand marketing revenue.

Revenue from the sale of hotel rooms, rental cars, and ticket attractions is recognized at the time the product is utilized, such as the time a purchased hotel room is occupied. The Company follows the accounting standards for principal versus agent revenue arrangements to determine the amount of revenue to be recognized for each element of a bundled sale involving air-related charges and third party products, in addition to airfare. Revenue from the sale of third party products is recorded net (treatment as an agent) of amounts paid to wholesale providers, travel agent commissions, and transaction costs.

Pursuant to the co-brand arrangement with Bank of America, the Company has various performance obligations which are collectively referred to as the marketing component. These obligations consist of use of the Company’s brand and access to its member lists, and certain other advertising and marketing elements. The marketing component is recorded as third party products revenue in the period in which points are awarded to the credit card holders.

Fixed Fee Contract Revenue

Fixed fee contract revenue consists of agreements to provide charter service on a year-round and ad hoc basis. Fixed fee contract revenue is recognized when transportation is provided.

Other Revenue

Other revenue is generated from leased aircraft, engines, and other miscellaneous sources. Lease revenue is recognized ratably over the lease term.

Accounts Receivable

Accounts receivable, reflected on the accompanying consolidated balance sheets, primarily consist of amounts due from credit card companies associated with passenger revenue. These receivables are short-term, generally settled within a few days of sale. Bad debt expense, which occurs in the form of credit card chargebacks, was not material in any period presented.

Taxes and Fees

Various taxes and fees, assessed on the sale of tickets to customers, are collected by the Company serving as an agent, and remitted to taxing authorities. These taxes and fees are not included as revenue in the Company’s consolidated statements of income and are recorded as a liability until remitted to the appropriate taxing authority.

Note 3 — Property and Equipment

Property and equipment (in thousands):



	As of September 30, 2018			As of December 31, 2017
Flight equipment, including pre-delivery deposits	$	1,867,655		$	1,539,433
Computer hardware and software	137,110			123,675
Land and buildings/leasehold improvements	88,882			77,409
Other property and equipment	75,529			48,446
Total property and equipment	2,169,176			1,788,963
Less accumulated depreciation and amortization	(352,371		)	(276,548		)
Property and equipment, net	$	1,816,805		$	1,512,415

Note 4 — Long-Term Debt

Long-term debt and capital lease obligations (in thousands):



	As of September 30, 2018			As of December 31, 2017
Fixed-rate debt and capital lease obligations due through 2030	$	644,116		$	465,462
Variable-rate debt due through 2028	668,933			699,430
Total long-term debt and capital lease obligations, net of related costs	1,313,049			1,164,892
Less current maturities, net of related costs	654,697			214,761
Long-term debt and capital lease obligations, net of current maturities and related costs	$	658,352		$	950,131

Weighted average fixed-interest rate on debt	5.3		%	5.4		%
Weighted average variable-interest rate on debt	4.0		%	3.3		%

Maturities of long-term debt and capital lease obligations for the remainder of 2018 and for the next five years and thereafter, in the aggregate, are: remaining in 2018 - $114.6 million; 2019 - $570.2 million; 2020 - $118.6 million; 2021 - $91.9 million; 2022 - $64.5 million; and $353.2 million thereafter.

Consolidated Variable Interest Entity

The Company evaluates ownership, contractual lease arrangements and other interests in entities to determine if they are variable interest entities ("VIEs") based on the nature and extent of those interests. These evaluations are complex and involve judgment and the use of estimates and assumptions based on available historical information and management’s judgment, among other factors. The Company consolidates a VIE when, among other criteria, it has the power to direct the activities that most significantly impact the VIE’s economic performance as well as the obligation to absorb losses or the right to receive benefits of the VIE, thus making the Company the primary beneficiary of the VIE.

In September 2018, the Company, through a wholly owned subsidiary, entered into agreements with a trust to borrow $44.0 million secured by one Airbus A320 series aircraft. The trust was funded on inception. These borrowings bear interest at a blended rate of 4.0 percent, payable in quarterly installments through September 2028, at which time the Company will have a purchase option at a fixed amount. As this transaction is a common control transaction, the Company, as the primary beneficiary, has measured and recorded the assets and liabilities at their carrying values, which were $37.8 million and $44.0 million, respectively, as of September 30, 2018.

Senior Secured Revolving Credit Facility

In 2015, the Company, through a wholly owned subsidiary, entered into a senior secured revolving credit facility under which it was entitled to borrow up to $56.0 million. In March 2018, the Company paid off the balance of the facility and amended it to increase the borrowing limit to $81.0 million. The amended facility has a term of 24 months and is based on the value of Airbus A320 series aircraft placed in the collateral pool. In July 2018, the Company drew down $46.9 million under this facility, and no principal payments have been made as of September 30, 2018. Aircraft may remain in the collateral pool for up to two years, and those currently collateralized were placed into the pool in December 2016. The notes for the amounts borrowed under the facility bear interest at a floating rate based on LIBOR and are due on March 31, 2020.

Other Secured Debt

In September 2018, the Company entered into a senior secured credit facility under which it is able to borrow up to $75.0 million. In that same month, the Company borrowed $55.5 million under this agreement secured by three Airbus A320 series aircraft. The remaining $19.5 million, secured by one Airbus A320 series aircraft, was borrowed in October 2018. The borrowing bears interest at a floating rate based on LIBOR, payable in quarterly installments over seven years.

In July 2018, the Company borrowed $34.5 million under a loan agreement secured by one Airbus A320 series aircraft. The note bears interest at a floating rate based on LIBOR, payable in quarterly installments over ten years.

In June 2018, the Company borrowed $10.8 million under a loan agreement secured by various ground equipment. The note bears interest at a fixed rate of 4.2 percent per year, payable in monthly installments over five years.

General Unsecured Senior Notes

In June 2014, the Company completed an offering of $300.0 million aggregate principal amount of senior unsecured obligations (the "Notes") which will mature in July 2019. In December 2016, the Company completed an offering of an additional $150.0 million principal amount of these notes, which were issued at a price of 101.5 percent of the principal amount, plus accrued interest from July 15, 2016. The Notes bear interest at a rate of 5.5 percent per year, payable in cash semi-annually, on January 15th and July 15th of each year.

The indenture pursuant to which the Notes were issued includes operating and financial restrictions on the Company. These restrictions limit or restrict, among other things, the Company’s ability and the ability of its restricted subsidiaries to (i) incur additional indebtedness; (ii) incur liens; (iii) make restricted payments (including paying dividends on, redeeming, repurchasing or retiring capital stock); (iv) make investments; and (v) consolidate, merge or sell all or substantially all of its assets. These covenants are subject to various exceptions and qualifications under the terms of the indenture. As of December 31, 2017 and September 30, 2018, the Company exceeded the consolidated total leverage ratio limit, which could affect the ability to make restricted payments in future periods after exhaustion of various exceptions. However, it is not expected that this will have any impact on the restricted payments routinely made in the ordinary course of business. The calculation is made on a quarterly basis based on the trailing 12 months.

Capital Leases

The Company has capital lease obligations related to aircraft, which significantly impacted our recognized assets and liabilities as of September 30, 2018, but did not result in any significant cash receipts or cash payments during the quarter.

Note 5 — Fair Value Measurements

The Company measures certain financial assets and liabilities at fair value on a recurring basis. Fair value is an exit price, representing the amount that would be received by selling an asset or paid to transfer a liability in an orderly transaction between market participants.

Accounting standards pertaining to fair value measurements establish a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. These tiers include: Level 1, defined as observable inputs such as quoted prices in active markets for identical assets or liabilities; Level 2, defined as inputs other than Level 1 inputs that are either directly or indirectly observable; and Level 3, defined as unobservable inputs for which little or no market data exists, therefore requiring an entity to develop its own assumptions.

The Company uses the market approach valuation technique to determine fair value for investment securities. The assets classified as Level 1 consist of money market funds for which original cost approximates fair value. The assets classified as Level 2 consist of commercial paper, municipal debt securities, federal agency debt securities, US Treasury Bonds, and corporate debt securities, which are valued using quoted market prices or alternative pricing sources including transactions involving identical or comparable assets and models utilizing market observable inputs. The Company has no investment securities classified as Level 3.

For those assets classified as Level 2 that are not in active markets, the Company obtains fair value from pricing sources using quoted market prices for identical or comparable instruments, and uses pricing models which include all significant observable inputs: maturity dates, issue dates, settlement dates, benchmark yields, reported trades, broker-dealer quotes, issue spreads, benchmark securities, bids, offers and other market related data. These inputs are observable or can be derived from, or corroborated by, observable market data for substantially the full term of the asset.

The fair value of the Company's derivative instrument is determined using standard valuation models. The significant inputs used in these models are readily available in public markets or can be derived from observable market transactions and therefore have been classified as Level 2. Inputs used in these standard valuation models for derivative instruments include the applicable exchange and interest rates.

Financial instruments measured at fair value on a recurring basis (in thousands):



	As of September 30, 2018						As of December 31, 2017
	Total		Level 1		Level 2		Total		Level 1		Level 2
Cash equivalents
Money market funds	$	45,227	$	45,227	$	—	$	1,297	$	1,297	$	—
Commercial paper	42,157		—		42,157		27,910		—		27,910
Municipal debt securities	2,053		—		2,053		2,782		—		2,782
Total cash equivalents	89,437		45,227		44,210		31,989		1,297		30,692
Short-term
Commercial paper	143,961		—		143,961		108,678		—		108,678
Corporate debt securities	99,556		—		99,556		107,878		—		107,878
Municipal debt securities	27,191		—		27,191		101,290		—		101,290
Federal agency debt securities	12,227		—		12,227		31,428		—		31,428
US Treasury Bonds	1,681		—		1,681		3,407		—		3,407
Total short-term	284,616		—		284,616		352,681		—		352,681
Long-term
Corporate debt securities	40,343		—		40,343		60,396		—		60,396
Federal agency debt securities	10,026		—		10,026		5,775		—		5,775
US Treasury Bonds	2,984		—		2,984		2,994		—		2,994
Municipal debt securities	—		—		—		9,405		—		9,405
Derivative instruments	—		—		—		282		—		282
Total long-term	53,353		—		53,353		78,852		—		78,852
Total financial instruments	$	427,406	$	45,227	$	382,179	$	463,522	$	1,297	$	462,225

The fair value of the Company’s publicly held long-term debt is determined based on inputs that are readily available in public markets or can be derived from information available in publicly quoted markets; therefore, the Company has categorized its publicly held debt as Level 2. The Company's remaining debt is not publicly held, and the Company has determined the estimated fair value of these notes to be Level 3, as certain inputs used to determine the fair value are unobservable and, therefore, could be sensitive to changes in inputs. The Company utilizes the discounted cash flow method to estimate the fair value of Level 3 debt.

Carrying value and estimated fair value of long-term debt, including current maturities and without reduction for related costs (in thousands):



	As of September 30, 2018				As of December 31, 2017
	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value		Hierarchy Level
Publicly held debt	$	450,679	$	455,749	$	451,321	$	462,604	2
Non-publicly held debt	742,878		663,776		719,681		660,065		3
Total long-term debt	$	1,193,557	$	1,119,525	$	1,171,002	$	1,122,669

Due to the short-term nature, carrying amounts of cash, cash equivalents, restricted cash, accounts receivable and accounts payable approximate fair value.

Note 6 — Shareholders’ Equity

The Company is authorized by the Board of Directors to acquire up to $100.0 million of its stock through open market purchases under its share repurchase program. As repurchase authority is used, the Board of Directors has, to date, authorized additional expenditures for share repurchases.

For the three and nine months ended September 30, 2018 and 2017, open market share repurchases consisted of the following:

Three Months Ended September 30,

Nine Months Ended September 30,

2018

2017

2018

2017

Shares repurchased (not in thousands) (1)

None

604,497

Average price per share

142.66

Total (in thousands)

None

86,240

(1) Does not include shares withheld from employees for tax withholding obligations related to restricted stock vestings.

During the nine months ended September 30, 2018, the Company declared and paid recurring cash dividends of $2.10 per share, or $33.9 million.

Note 7 — Earnings per Share

Basic and diluted earnings per share are computed pursuant to the two-class method. Under this method, the Company attributes net income to two classes: common stock and unvested restricted stock. Unvested restricted stock awards granted to employees under the Company’s Long-Term Incentive Plan are considered participating securities as they receive non-forfeitable rights to cash dividends at the same rate as common stock.

Diluted net income per share is calculated using the more dilutive of the two methods. Under both methods, the exercise of employee stock options is assumed using the treasury stock method. The assumption of vesting of restricted stock, however, differs:


1.	Assume vesting of restricted stock using the treasury stock method.


2.	Assume unvested restricted stock awards are not vested, and allocate earnings to common shares and unvested restricted stock awards using the two-class method.

For the three and nine months ended September 30, 2018, the second method, which assumes unvested awards are not vested, was used in the computation because it was more dilutive than the first method.

The following table sets forth the computation of net income per share, on a basic and diluted basis, for the periods indicated (share count and dollar amounts other than per-share amounts in table are in thousands):



	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Basic:
Net income	$	15,147		$	23,384		$	120,356		$	114,773
Less net income allocated to participating securities	(194		)	(331		)	(1,602		)	(1,784		)
Net income attributable to common stock	$	14,953		$	23,053		$	118,754		$	112,989
Earnings per share, basic	$	0.94		$	1.45		$	7.46		$	7.00
Weighted-average shares outstanding	15,957			15,852			15,929			16,142
Diluted:
Net income	$	15,147		$	23,384		$	120,356		$	114,773
Less net income allocated to participating securities	(194		)	(330		)	(1,601		)	(1,782		)
Net income attributable to common stock	$	14,953		$	23,054		$	118,755		$	112,991
Earnings per share, diluted	$	0.94		$	1.45		$	7.45		$	6.99
Weighted-average shares outstanding	15,957			15,852			15,929			16,142
Dilutive effect of stock options and restricted stock	35			18			42			60
Adjusted weighted-average shares outstanding under treasury stock method	15,992			15,870			15,971			16,202
Participating securities excluded under two-class method	(30		)	(8		)	(33		)	(42		)
Adjusted weighted-average shares outstanding under two-class method	15,962			15,862			15,938			16,160

For the three and nine months ended September 30, 2018, anti-dilutive shares excluded from the calculation of earnings per share were 39,943 and 74,873 shares (not in thousands), respectively.

Note 8 — Commitments and Contingencies

As of September 30, 2018, the Company had firm commitments to purchase ten Airbus A320 series aircraft. In addition, the Company has entered into lease agreements for 12 Airbus A320 aircraft, four of which have been delivered and are in service, and one of which has been delivered but was not in service as of September 30, 2018.

Future minimum fixed payments for the Company's commitments related to the acquisition of aircraft (including aircraft lease obligations), airport fees under use and lease agreements, and other operating lease obligations are as follows as of September 30, 2018 (in thousands):



	As of September 30, 2018
Remaining in 2018	$	44,154
2019	116,322
2020	62,382
2021	21,248
2022	19,159
Thereafter	122,414
Total commitments	$	385,679

Contingencies

The Company is subject to certain legal and administrative actions it considers routine to its business activities. The Company believes the ultimate outcome of any pending legal or administrative matters will not have a material adverse impact on its financial position, liquidity or results of operations.

Note 9 — Related Party Transactions

During the three and nine months ended September 30, 2018, no related party transactions occurred requiring disclosure.

Entities owned or controlled by the Company's Chairman and CEO have been paid for the building of corporate training content. During the nine months ended September 30, 2017, the Company made payments to these entities of $0.2 million. No further payments are expected.

Note 10 — Subsequent Events

In October 2018, the Company executed a purchase agreement for one Airbus A320 series aircraft, for which delivery is expected in the second quarter 2019.

Also in October 2018, the remaining $19.5 million was borrowed under a senior secured credit facility entered into by the Company in September, which is secured by one Airbus A320 series aircraft.

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

The following discussion and analysis presents factors that had a material effect on our results of operations during the three and nine months ended September 30, 2018 and 2017. Also discussed is our financial position as of September 30, 2018 and December 31, 2017. You should read this discussion in conjunction with our unaudited consolidated financial statements, including the notes thereto, appearing elsewhere in this Form 10-Q and our consolidated financial statements appearing in our annual report on Form 10-K for the year ended December 31, 2017. This discussion and analysis contains forward-looking statements. Please refer to the section below entitled “Cautionary Note Regarding Forward-Looking Statements” for a discussion of the uncertainties, risks and assumptions associated with these statements.

Third Quarter Review

AIRCRAFT

The following table sets forth the aircraft in service and operated by us as of the dates indicated:



	September 30, 2018	December 31, 2017	September 30, 2017
MD-80	19	37	40
B757-200	—	—	2
A319 (1)	31	22	21
A320 (2)	43	30	26
Total	93	89	89

(1) Does not include A319 aircraft on lease to a European carrier as of the respective date.

(2) Does not include A320 aircraft for which we have taken delivery but were not yet in service as of the respective date.

As of September 30, 2018, we had firm commitments to purchase ten Airbus A320 series aircraft and had executed lease agreements for seven Airbus A320 aircraft which have yet to be delivered. We expect delivery of three aircraft in 2018 and the remaining aircraft in 2019 and 2020. We continually consider aircraft acquisitions on an opportunistic basis.

Fleet Plan

The below table indicates the number of aircraft expected to be in service as of the dates indicated, based on currently scheduled additions to, and retirements from, our operating fleet.



	As of December 31, 2018	As of March 31, 2019
MD-80	—	—
A319	32	37
A320	44	48
Total	76	85

NETWORK

As of September 30, 2018, we were operating 411 routes versus 373 as of the same date last year, which represents a 10.2 percent increase. Our total numbers of origination cities and leisure destinations were 96 and 22, respectively, as of September 30, 2018. Based on our currently published schedule through May 2019, and service announcements and cancellations by other airlines to date, we will have direct competition (which we consider to be non-stop service between similar markets) on 101 of our routes as of that date.

We also announced service to three new cities: Albany, New York; St. George, Utah and Tucson, Arizona. These routes are planned to begin in November and December 2018.

TRENDS

We added eight Airbus A320 series aircraft to our operating fleet during the third quarter of 2018 as we near the conclusion of our fleet transition. Two additional aircraft are expected to be added by year-end, and the remaining MD-80 aircraft will be retired by the end of November 2018. Airbus aircraft flew 86.5 percent of our scheduled service ASMs for the quarter, compared to 62.6 percent for the same time period in 2017, which drove a 6.7 percent increase in fuel efficiency (measured as ASMs per gallon).

Although the number of aircraft in our fleet will decline by the end of the year with the retirement of all our MD-80 aircraft, we intend to continue increasing capacity through higher utilization rates on our Airbus fleet than we have had on our MD-80 aircraft. Additionally, our Airbus fleet has more available seats, on average, than our MD-80 fleet. However, our capacity growth through the end of 2018 will be lower than in prior years as a result of our fleet transition and the effects of aircraft delivery delays throughout the year.

Planning and development for Sunseeker Resort - Charlotte Harbor is ongoing. Construction is expected to begin in the first quarter of 2019, with the opening of the resort planned for 2020.

Our flight dispatchers voted for union representation by the International Brotherhood of Teamsters ("IBT") and negotiations began in February 2017. The dispatchers failed to ratify a tentative agreement reached in May 2018 and, as a result, negotiations continue. There are approximately 40 employees in this operating group.

In March 2018, our maintenance technicians who represent approximately nine percent of our total employee base (approximately 340 employees), voted for union representation by the IBT. Negotiations for an agreement with this group are expected to begin in the near future.

In July 2018, the IBT announced that our pilots were supportive of a strike as a result of delays in our implementation of a new preferential bidding system for pilot flight assignments. We do not believe we are in violation of the collective bargaining agreement with our pilots in this regard, nor do we believe the pilots have a legal right to strike because of this issue. As a result, we have filed suit against the IBT seeking to foreclose the possibility of a strike at this time.

Any labor actions whether following an inability to reach a collective bargaining agreement with any employee group or otherwise could impact our operations during the continuance of any such activity. Any labor agreement reached following negotiations would also likely increase our operating costs.

RESULTS OF OPERATIONS

Comparison of three months ended September 30, 2018 to three months ended September 30, 2017

Operating Revenue

Passenger revenue. Passenger revenue now includes both scheduled service revenue and ancillary air-related revenue, due to the implementation of the New Revenue Standard. For the third quarter 2018, passenger revenue increased 12.6 percent compared to third quarter 2017. The increase was driven primarily by a 12.9 percent increase in scheduled service departures and a 0.5 percentage point increase in load factor, which resulted in 15.4 percent more scheduled service passengers traveling. The higher number of passengers resulted in quarter-over-quarter increases in ancillary revenue products such as baggage, seat and convenience fees.

Third party products revenue. Third party products revenue for the third quarter 2018 increased 28.9 percent overall compared to 2017, due primarily to an increase in net revenue from rental cars resulting from the increase in scheduled service passengers, as well as revenue generated from our co-branded credit card.

Fixed fee contract revenue. Fixed fee contract revenue for the third quarter 2018 increased 25.0 percent from 2017. This is primarily due to increased flying for the Department of Defense, as we have refocused on increasing our fixed fee flying as our fleet has grown, and due to the greater desirability of Airbus aircraft for fixed fee flights.

Other revenue. Other revenue decreased by $3.4 million for the third quarter 2018 from 2017 primarily as six aircraft which generated lease revenue from a European carrier during the third quarter 2017, had been delivered to us prior to the third quarter 2018.

Operating Expenses

We primarily evaluate our expense management by comparing our costs per passenger and per ASM across different periods, which enables us to assess trends in each expense category. The following table presents operating expense per passenger for the indicated periods. The table also presents operating expense per passenger, excluding fuel, a statistic which gives management and investors the ability to measure and monitor our cost performance absent fuel price volatility. Both the cost and availability of fuel are subject to many economic and political factors beyond our control.



	Three Months Ended September 30,				Percent
	2018		2017		Change
Aircraft fuel	$	32.40	$	26.41	22.7	%
Salary and benefits	27.89		29.15		(4.3	)
Station operations	12.31		12.20		0.9
Maintenance and repairs	9.13		9.48		(3.7	)
Depreciation and amortization	9.89		10.47		(5.5	)
Sales and marketing	4.79		4.56		5.0
Aircraft lease rentals	0.19		0.18		5.6
Other	8.12		7.97		1.9
Operating expense per passenger	$	104.72	$	100.42	4.3	%
Operating expense per passenger, excluding fuel	$	72.32	$	74.01	(2.3	)%

The following table presents unit costs on a per ASM basis, or CASM, for the indicated periods. As on a per-passenger basis, excluding fuel on a per ASM basis provides management and investors the ability to measure and monitor our cost performance absent fuel price volatility.



	Three Months Ended September 30,						Percent
	2018			2017			Change
Aircraft fuel		3.12	¢		2.50	¢	24.8	%
Salary and benefits	2.68			2.76			(2.9	)
Station operations	1.18			1.15			2.6
Maintenance and repairs	0.88			0.90			(2.2	)
Depreciation and amortization	0.95			0.99			(4.0	)
Sales and marketing	0.46			0.43			7.0
Aircraft lease rentals	0.02			0.02			—
Other	0.78			0.75			4.0
CASM		10.07	¢		9.50	¢	6.0	%
Operating CASM, excluding fuel	6.95			7.00			(0.7	)
Non-airline CASM*	0.16			0.08			100.0
Operating CASM, excluding fuel and non-airline expenses		6.79	¢		6.92	¢	(1.9	)%

*Operating cost per ASM for non-airline subsidiaries

Aircraft fuel expense. Aircraft fuel expense increased $33.1 million, or 41.2 percent, for the third quarter 2018 compared to 2017 as the system average fuel cost per gallon increased by 33.1 percent, coupled with a 6.0 percent increase in system fuel gallons consumed on a 13.2 percent increase in system ASMs. ASM growth outpaced fuel consumption as fuel efficiency (measured as ASMs per gallon) increased 6.7 percent year over year due to increased flying on our Airbus aircraft which are more fuel efficient than our MD-80 aircraft.

Salary and benefits expense. Salary and benefits expense increased $8.9 million, or 10.0 percent, for the third quarter 2018 when compared to the same period last year. The increase is largely due to a 3.5 percent increase in full-time equivalent employees. Maintaining a larger number of flight crew personnel until the fleet transition is complete, as well as effects of the collective bargaining agreement with our flight attendants (which went into effect in December 2017) contributed to salary expense for our flight crew employees increasing by 17.0 percent compared to 2017.

Station operations expense. Station operations expense for the third quarter 2018 increased 16.1 percent on a 12.9 percent increase in scheduled service departures compared to the same period in 2017. The increase in expense outpaced the increase in departures due primarily to rate increases for airport, landing and ground handling fees at our larger airports which tend to be more expensive.

Maintenance and repairs expense. Maintenance and repairs expense for the third quarter 2018 increased $3.1 million, or 10.8 percent, compared to the same period in 2017. The year-over-year increase is due primarily to a one-time fleet-wide maintenance campaign to baseline our Airbus aircraft which was mostly completed in third quarter 2018, coupled with a 6.6 percent increase in the average number of operating aircraft in service. These increases were partially offset by fewer heavy maintenance events performed on our MD-80 aircraft, as they are being systematically retired from our operating fleet. Additionally, the cost of major maintenance events for our Airbus aircraft is deferred in accordance with the deferral method of accounting and the amortization of these expenses is included in depreciation and amortization expense.

Depreciation and amortization expense. Depreciation and amortization expense for the third quarter 2018 increased 8.7 percent year over year, primarily related to a 6.6 percent increase in average number of aircraft in service. We continue to add Airbus aircraft into service, and this fleet type has a higher monthly depreciation expense. Depreciation expense for this fleet was $23.0 million for the third quarter 2018 compared to $15.7 million for the same period in 2017. Amortization of major maintenance costs under the deferral method of accounting for the Airbus aircraft was $2.9 million for the third quarter 2018 compared to $1.7 million for the third quarter 2017.

Additionally, as an impairment charge was taken on our MD-80 aircraft in the fourth quarter 2017, no depreciation expense for this fleet has been recognized during the year. Depreciation expense related to the MD-80 aircraft and Boeing 757-200 aircraft (retired in late 2017) for the three months ended September 30, 2017 was $5.0 million and $1.4 million, respectively.

Sales and marketing expense. Sales and marketing expense for the third quarter 2018 increased $2.9 million compared to the same period in 2017, partly due to an increase in net credit card fees paid as a result of the 12.6 percent increase in passenger revenue year over year. There were also increased expenses related to various marketing initiatives.

Aircraft lease rentals expense. Aircraft lease rentals expense for the third quarter 2018, consisting solely of sub-service expenses, remained relatively flat compared to 2017. We do not currently have aircraft under operating leases.

Other expense. Other operating expense for the third quarter 2018 increased $4.1 million compared to 2017. The increase is due to various administrative expenses incurred to support our airline operations, golf course management business and Sunseeker Resorts.

Non-airline expenses

Non-airline expenses are included in the various line items discussed above, as appropriate. The non-airline expenses include expenses from our Teesnap golf management business, expenses incurred to operate the Kingsway golf course since we acquired it in August 2018, operating expenses attributable to Sunseeker Resorts (most of the Sunseeker Resort expenses are being capitalized at this time) and expenses incurred in connection with the pilot program of family entertainment centers currently in development.

Income Tax Expense

Our effective tax rate was negative 5.1 percent for the three months ended September 30, 2018, compared to 35.3 percent for the three months ended September 30, 2017. The effective tax rate for the three months ended September 30, 2018 differed from the statutory federal income tax rate of 21.0 percent primarily due to a one-time benefit of an income tax refund for tax deductions not previously claimed, which was offset by state taxes. While we expect our tax rate to be fairly consistent in the near term, it will vary depending on recurring items such as the amount of income we earn in each state and the state tax rate applicable to such income. Discrete items during interim periods may also affect our tax rates.

Comparison of nine months ended September 30, 2018 to nine months ended September 30, 2017

Operating Revenue

Passenger revenue. Passenger revenue now includes both scheduled service revenue and ancillary air-related revenue, due to the implementation of the New Revenue Standard. For the nine months ended September 30, 2018, passenger revenue increased 12.3 percent compared with 2017. The increase was mostly attributable to a 10.8 percent increase in scheduled service departures and a 1.4 percentage point increase in load factor, which resulted in 14.4 percent more scheduled service passengers traveling. The higher number of passengers resulted in year-to-date increases in ancillary revenue products such as baggage, seat and convenience fees.

Third party products revenue. Third party products revenue for the nine months ended September 30, 2018 increased 11.8 percent over the same period in 2017 primarily due to an increase in net revenue from rental cars.

Fixed fee contract revenue. Fixed fee contract revenue for the nine months ended September 30, 2018 decreased 3.3 percent compared with 2017. This was planned and expected due to less availability of aircraft for charter flying in the first half of 2018. The decrease was partially offset by increased flying for the Department of Defense in the third quarter 2018.

Other revenue. Other revenue decreased $7.3 million for the nine months ended September 30, 2018 compared to 2017 primarily as six aircraft which generated lease revenue from a European carrier during the nine months ended September 30, 2017 were delivered to us in the first half of 2018. The effects of this decrease were slightly offset by increases in revenue from our golf course management solution as well as revenue generated from the leasing of spare RB-211 engines.

Operating Expenses

The following table presents operating expense per passenger for the indicated periods:



	Nine Months Ended September 30,				Percent
	2018		2017		Change
Aircraft fuel	$	32.54	$	27.13	19.9	%
Salary and benefits	29.71		30.03		(1.1	)
Station operations	11.63		11.69		(0.5	)
Maintenance and repairs	7.22		9.49		(23.9	)
Depreciation and amortization	8.81		10.03		(12.2	)
Sales and marketing	5.16		4.41		17.0
Aircraft lease rentals	0.07		0.34		(79.4	)
Other	7.13		7.41		(3.8	)
Operating expense per passenger	$	102.27	$	100.53	1.7	%
Operating expense per passenger, excluding fuel	$	69.73	$	73.40	(5.0	)%

The following table presents unit costs on a per ASM basis, defined as Operating CASM, for the indicated periods:



	Nine Months Ended September 30,						Percent
	2018			2017			Change
Aircraft fuel		3.03	¢		2.46	¢	23.2	%
Salary and benefits	2.77			2.72			1.8
Station operations	1.08			1.06			1.9
Maintenance and repairs	0.67			0.86			(22.1	)
Depreciation and amortization	0.82			0.91			(9.9	)
Sales and marketing	0.48			0.40			20.0
Aircraft lease rentals	0.01			0.03			(66.7	)
Other	0.66			0.68			(2.9	)
CASM		9.52	¢		9.12	¢	4.4	%
Operating CASM, excluding fuel	6.49			6.66			(2.6	)
Non-airline CASM*	0.11			0.07			57.1
Operating CASM, excluding fuel and non-airline expenses		6.38	¢		6.59	¢	(3.2	)%

*Operating cost per ASM for non-airline subsidiaries

Aircraft fuel expense. Aircraft fuel expense increased $91.5 million, or 36.5 percent, for the nine months ended September 30, 2018 compared to the same period in 2017 as the system average fuel cost per gallon increased by 30.3 percent, coupled with a 4.3 percent increase in system fuel gallons consumed on a 10.9 percent increase in system ASMs. ASM growth outpaced fuel consumption as fuel efficiency (measured as ASMs per gallon) increased 6.3 percent year over year, due to increased flying on our Airbus aircraft which are more fuel efficient than our MD-80 aircraft.

Salary and benefits expense. Salary and benefits expense increased $35.0 million, or 12.6 percent, for the nine months ended September 30, 2018 compared to the same period in 2017. The increase is largely attributable to a 3.5 percent increase in the number of full-time equivalent employees. Maintaining a larger number of flight crew personnel until the fleet transition is complete, as well as effects of the collective bargaining agreement with our flight attendants (which went into effect in December 2017) contributed to salary expense for our flight crew employees increasing by 19.0 percent compared to 2017.

Station operations expense. Station operations expense for the nine months ended September 30, 2018 increased 13.2 percent on a 10.8 percent increase in scheduled service departures compared to the same period in 2017. The increase in expense outpaced the increase in departures due to certain station incentives which expired during the first quarter of 2018, coupled with rate increases for airport, landing and ground handling fees at our larger airports which tend to be more expensive.

Maintenance and repairs expense. Maintenance and repairs expense for the nine months ended September 30, 2018 decreased $11.7 million, or 13.4 percent, compared with the same period in 2017. The year-over-year decrease is due to fewer heavy maintenance events performed on our MD-80 series aircraft, as they are being systematically retired from our operating fleet. Additionally, the cost of major maintenance events for our Airbus aircraft is deferred in accordance with the deferral method of accounting and the amortization of these expenses is included under depreciation and amortization expense.

Depreciation and amortization expense. Depreciation and amortization expense for the nine months ended September 30, 2018 remained flat year over year which resulted from an increase in Airbus depreciation, offset by the elimination of depreciation on our MD-80 fleet due to the effect of the impairment charge in 2017. Our average number of operating aircraft increased 6.7 percent, with the increase attributable to the addition of Airbus aircraft, and this fleet type has a higher monthly depreciation expense. The total depreciation expense for this fleet was $61.0 million for the nine months ended September 30, 2018 compared to $42.2 million for the same period in 2017. Additionally, amortization of major maintenance costs under the deferral method of accounting for the Airbus aircraft was $8.0 million for the nine months ended September 30, 2018 compared to $4.6 million for 2017.

No depreciation expense is being recognized in the current year for our MD-80 fleet as an impairment charge was taken in the fourth quarter 2017. Depreciation expense related to the MD-80 aircraft and Boeing 757-200 aircraft (retired in late 2017) for the nine months ended September 30, 2017 was $16.4 million and $4.3 million, respectively.

Sales and marketing expense. Sales and marketing expense for the nine months ended September 30, 2018 increased $13.5 million compared to the same period in 2017, partly due to an increase in net credit card fees paid as a result of a 12.3 percent increase in passenger revenue year over year. There were also increased expenses related to various marketing initiatives.

Aircraft lease rentals expense. Aircraft lease rentals expense for the nine months ended September 30, 2018 decreased $2.3 million compared to the same period in 2017 due to improved operations which drove fewer sub-service flights in the current year. We do not currently have aircraft under operating leases.

Other expense. Other operating expense for the nine months ended September 30, 2018 increased $6.4 million compared to 2017. The increase is primarily due to information technology administration expenses, as well as other expenses incurred to support our airline operations, golf course management business and Sunseeker Resorts.

Non-airline expenses

Non-airline expenses are included in the various line items discussed above, as appropriate. The non-airline expenses include expenses from our Teesnap golf management business, expenses incurred to operate the Kingsway golf course since we acquired it in August 2018, operating expenses attributable to Sunseeker Resorts (most of the Sunseeker Resorts expenses are being capitalized at this time) and expenses incurred in connection with the pilot program of family entertainment centers currently in development.

Income Tax Expense

Our effective tax rate was 18.0 percent for the nine months ended September 30, 2018, compared to 36.9 percent for the nine months ended September 30, 2017. The effective tax rate for the nine months ended September 30, 2018 differed from the statutory federal income tax rate of 21.0 percent primarily due to a one-time benefit of an income tax refund for tax deductions not previously claimed, and the tax benefit from dissolution of foreign subsidiaries, the effects of which were offset by state taxes. While we expect our tax rate to be fairly consistent in the near term, it will vary depending on recurring items such as the amount of income we earn in each state and the state tax rate applicable to such income. Discrete items during interim periods may also affect our tax rates.

Comparative Consolidated Operating Statistics

The following tables set forth our operating statistics for the periods indicated:



	Three Months Ended September 30,						Percent
	2018			2017			Change (1)
Operating statistics (unaudited):
Total system statistics:
Passengers	3,503,849			3,045,642			15.0
Revenue passenger miles (RPMs) (thousands)	3,037,540			2,672,963			13.6
Available seat miles (ASMs) (thousands)	3,643,948			3,220,246			13.2
Load factor	83.4		%	83.0		%	0.4
Operating expense per ASM (CASM) (cents)	10.07			9.50			6.0
Fuel expense per ASM (cents)	3.12			2.50			24.8
Operating CASM, excluding fuel (cents)	6.95			7.00			(0.7	)
ASMs per gallon of fuel	77.5			72.6			6.7
Departures	25,601			22,723			12.7
Block hours	56,329			49,932			12.8
Average stage length (miles)	838			842			(0.5	)
Average number of operating aircraft during period	95.6			89.7			6.6
Average block hours per aircraft per day	6.4			6.1			4.9
Full-time equivalent employees at end of period	3,835			3,704			3.5
Fuel gallons consumed (thousands)	47,016			44,346			6.0
Average fuel cost per gallon	$	2.41		$	1.81		33.1



Scheduled service statistics:
Passengers	3,461,267			2,998,476			15.4
Revenue passenger miles (RPMs) (thousands)	2,988,962			2,618,446			14.2
Available seat miles (ASMs) (thousands)	3,485,800			3,073,360			13.4
Load factor	85.7		%	85.2		%	0.5
Departures	24,281			21,498			12.9
Block hours	53,723			47,481			13.1
Total passenger revenue per ASM (TRASM) (cents) (2)	10.64			10.66			(0.2	)
Average fare - scheduled service (3)	$	59.23		$	61.34		(3.4	)
Average fare - air-related charges (3)	$	43.36		$	43.81		(1.0	)
Average fare - third party products	$	4.60		$	4.12		11.7
Average fare - total	$	107.19		$	109.27		(1.9	)
Average stage length (miles)	845			849			(0.5	)
Fuel gallons consumed (thousands)	44,910			42,193			6.4
Average fuel cost per gallon	$	2.41		$	1.80		33.9
Rental car days sold	472,301			338,212			39.6
Hotel room nights sold	95,690			90,996			5.2
Percent of sales through website during period	93.7		%	93.3		%	0.4

(1) Except load factor and percent of sales through website during period, which are presented as a percentage point change.

(2) Various components of this measure do not have a direct correlation to ASMs. This measure is provided on a per ASM basis so as to facilitate comparison with airlines reporting revenues on a per ASM basis.

(3) Reflects division of passenger revenue between scheduled service and air-related charges in the Company's booking path.



	Nine Months Ended September 30,						Percent
	2018			2017			Change (1)
Operating statistics (unaudited):
Total system statistics:
Passengers	10,510,913			9,233,083			13.8
Revenue passenger miles (RPMs) (thousands)	9,408,944			8,340,269			12.8
Available seat miles (ASMs) (thousands)	11,294,805			10,181,292			10.9
Load factor	83.3		%	81.9		%	1.4
Operating expense per ASM (CASM) (cents)	9.52			9.12			4.4
Fuel expense per ASM (cents)	3.03			2.46			23.2
Operating CASM, excluding fuel (cents)	6.49			6.66			(2.6	)
ASMs per gallon of fuel	76.8			72.2			6.3
Departures	76,912			69,739			10.3
Block hours	174,838			159,181			9.8
Average stage length (miles)	868			870			(0.2	)
Average number of operating aircraft during period	92.4			86.6			6.7
Average block hours per aircraft per day	6.9			6.7			3.0
Full-time equivalent employees at end of period	3,835			3,704			3.5
Fuel gallons consumed (thousands)	147,172			141,054			4.3
Average fuel cost per gallon	$	2.32		$	1.78		30.3



Scheduled service statistics:
Passengers	10,422,579			9,110,745			14.4
Revenue passenger miles (RPMs) (thousands)	9,299,355			8,183,636			13.6
Available seat miles (ASMs) (thousands)	10,883,630			9,747,395			11.7
Load factor	85.4		%	84.0		%	1.4
Departures	73,537			66,355			10.8
Block hours	167,947			151,988			10.5
Total passenger revenue per ASM (TRASM) (cents) (2)	11.04			10.98			0.5
Average fare - scheduled service (3)	$	65.72		$	68.04		(3.4	)
Average fare - air-related charges (3)	$	45.33		$	45.06		0.6
Average fare - third party products	$	4.23		$	4.32		(2.1	)
Average fare - total	$	115.28		$	117.42		(1.8	)
Average stage length (miles)	874			875			(0.1	)
Fuel gallons consumed (thousands)	141,452			134,906			4.9
Average fuel cost per gallon	$	2.31		$	1.76		31.3
Rental car days sold	1,408,357			1,104,933			27.5
Hotel room nights sold	313,360			304,234			3.0
Percent of sales through website during period	93.8		%	94.1		%	(0.3	)

(1) Except load factor and percent of sales through website during period, which are presented as a percentage point change.

(3) Reflects division of passenger revenue between scheduled service and air-related charges in the Company's booking path.

LIQUIDITY AND CAPITAL RESOURCES

Current liquidity

Cash, restricted cash and investment securities (short-term and long-term) remained relatively flat from December 31, 2017 to September 30, 2018, at $501.9 million and $499.0 million, respectively. Restricted cash represents escrowed funds under fixed fee contracts and cash collateral against letters of credit required by hotel properties for guaranteed room availability, airports and certain other parties. Under our fixed fee flying contracts, we require our customers to prepay for flights to be provided by us. The prepayments are escrowed until the flight is completed and are recorded as restricted cash with a corresponding amount reflected as air traffic liability. Investment securities represent highly liquid marketable securities which are available-for-sale.

During the first nine months of 2018, our primary source of funds was $290.1 million generated by operations. Our operating cash flows and long-term debt borrowings have allowed us to invest in our fleet transition and return capital to shareholders. Our future capital needs are primarily for the acquisition of additional aircraft, including our existing Airbus A320 series aircraft commitments, as well as planned capital outlay related to Sunseeker Resorts and other travel and leisure initiatives.

We believe we have more than adequate liquidity resources through our operating cash flows, borrowings, and cash balances, to meet our future contractual obligations. In addition, we continue to consider raising funds through debt financing on an opportunistic basis. We plan to refinance our $450.0 million of unsecured notes in advance of their maturities in July 2019.

In addition to our recurring quarterly cash dividend, our current share repurchase authority is $100 million. There is no expiration to this program.

Debt

Our long-term debt and capital lease obligations balance, without reduction for related issuance costs, increased from $1.2 billion as of December 31, 2017 to $1.3 billion as of September 30, 2018 as we borrowed additional funds secured by aircraft, while making scheduled repayments on our existing debt. During the third quarter of 2018, we borrowed $134.0 million secured by aircraft and $46.9 million against our senior secured revolving credit facility.

Sources and Uses of Cash

Operating Activities. During the nine months ended September 30, 2018, our operating activities provided $290.1 million of cash compared to $302.1 million during the same period of 2017. The year-over-year decrease in cash inflows resulted from adjustments made for non-cash items such as deferred income taxes ($43.0 million lower in 2018) which more than offset a $5.6 million increase in net income.

Operating cash inflows are primarily derived from providing air transportation and related ancillary products and services to customers, and we expect to use that cash flow to purchase aircraft and equipment, make scheduled debt payments, invest in Sunseeker Resort - Charlotte Harbor and other travel and leisure initiatives, and return capital to shareholders through share repurchases and dividends.

Investing Activities. Cash used in investing activities was $187.1 million during the nine months ended September 30, 2018 compared to $366.3 million for the same period in 2017. The year-over-year decrease is mostly due to investment security activity, as cash proceeds from maturities of investment securities (net of purchases) were $92.3 million in the first nine months of 2018 compared to cash used to purchase investment securities (net of proceeds) of $33.9 million for the same period in 2017. Cash used to purchase property and equipment was $274.0 million for the first nine months of 2018 compared to $333.7 million in the same period of 2017.

Financing Activities. Cash used in financing activities for the nine months ended September 30, 2018 was $12.6 million while cash provided by financing activities was $79.2 million for the same period in 2017. This year-over-year fluctuation is primarily due to an increase in principal payments on long-term debt and capital lease obligations in the current year, as we paid $171.4 million in debt and capital lease payments during the nine months ended September 30, 2018 compared to $88.0 million for the same period in 2017. Our debt payments in the first three quarters of 2018 also included various scheduled balloon payments. Additionally, we received $191.7 million in loan proceeds during the nine months ended September 30, 2018, compared to $292.5 million for the same period in 2017. For the nine months ended September 30, 2018, we paid cash dividends of $33.9 million, compared to $34.5 million in 2017, in addition to $86.2 million in open market common stock repurchases.

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

We have made forward-looking statements in this quarterly report on Form 10-Q, and in the section entitled “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” that are based on our management’s beliefs and assumptions, and on information currently available to our management. Forward-looking statements include information concerning our possible or assumed future results of operations, business strategies, fleet plan, financing plans, competitive position, industry environment, potential growth opportunities, future service to be provided, the effects of future regulation and competition, and the development of a resort in Southwest Florida. Forward-looking statements include all statements that are not historical facts and can be identified by the use of forward-looking terminology such as the words “believe,” “expect,” “anticipate,” “intend,” “plan,” “estimate,” “project” or similar expressions.

Forward-looking statements involve risks, uncertainties and assumptions. Actual results may differ materially from those expressed in the forward-looking statements. Important risk factors that could cause our results to differ materially from those expressed in the forward-looking statements may be found in our periodic reports filed with the Securities and Exchange Commission at www.sec.gov. These risk factors include, without limitation, an accident involving or problems with our aircraft, public perception of our safety, our reliance on automation systems, limitation on growth as we transition to a single fleet type, our reliance on third parties to deliver aircraft under contract to us on a timely basis, risk of breach of security of personal data, volatility of fuel costs, labor issues and costs, the ability to obtain regulatory approvals as needed, the effect of economic conditions on leisure travel, debt covenants and balances, the ability to finance aircraft under contract, terrorist attacks, risks inherent to airlines, the competitive environment, our reliance on third parties who provide facilities or services to us, the possible loss of key personnel, economic and other conditions in markets in which we operate, the ability to successfully develop a resort in Southwest Florida, the continued successful operation of the airline to generate cash flow for use to develop Sunseeker Resort - Charlotte Harbor, governmental regulation, increases in maintenance costs and cyclical and seasonal fluctuations to our operating results.

Any forward-looking statements are based on information available to us today and we undertake no obligation to publicly update any forward-looking statements, whether as a result of future events, new information or otherwise.

CRITICAL ACCOUNTING POLICIES AND ESTIMATES

Except as discussed below relating to the New Revenue Standard, in the third quarter of 2018, there were no changes to our critical accounting policies and estimates from those disclosed in the Consolidated Financial Statements and accompanying notes contained in our 2017 Form 10-K.

Effective January 1, 2018, we adopted the New Revenue Standard using the full retrospective method, which resulted in the recast of the 2017 prior period data presented. Under this ASU and subsequently issued amendments, revenue is recognized at the time a good or service is transferred to a customer for the amount of consideration received.

Item 3. Quantitative and Qualitative Disclosures About Market Risk

We are subject to certain market risks, including commodity prices (specifically aircraft fuel). The adverse effects of changes in these markets could pose potential losses as discussed below. The sensitivity analysis provided 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 be significantly impacted by changes in the price and availability of aircraft fuel, as aircraft fuel expense represented 31.8 percent of our operating expenses for the nine months ended September 30, 2018. Increases in fuel prices, or a shortage of supply, could have a material impact on our operations and operating results. Based on our fuel consumption for the three and nine months ended September 30, 2018, a hypothetical ten percent increase in the average price per gallon of fuel would have increased fuel expense by approximately $11.1 million and $33.3 million, respectively. We have not hedged fuel price risk for many years.

Interest Rates

As of September 30, 2018, we had a total of $673.2 million in variable-rate debt, including current maturities and without reduction for related costs. A hypothetical 100 basis point change in market interest rates for the nine months ended September 30, 2018, would have affected interest expense by approximately $5.2 million.

As of September 30, 2018, we had $520.3 million of fixed-rate debt, including current maturities and without reduction for related costs. A hypothetical 100 basis point change in market interest rates would not impact interest expense on our fixed rate debt as of such date.

See Item 7A "Quantitative and Qualitative Disclosures About Market Risk" in the Company's Annual Report on Form 10-K for the year ended December 31, 2017, for further information about market risk.

Item 4. Controls and Procedures

As of September 30, 2018, under the supervision and with the participation of our management, including our chief executive officer ("CEO") and chief financial officer (“CFO”), we evaluated the design and operation of our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) of the Securities Exchange Act of 1934, as amended, or the “Exchange Act”) as of the end of the period covered by this report. Based on that evaluation, management, including our CEO and CFO, has concluded that our disclosure controls and procedures are designed, and are effective, to give reasonable assurance that the information we are required to disclose is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms and is accumulated and communicated to the Company’s management, including the CEO and the CFO, as appropriate to allow timely decisions regarding required disclosure.

There were no changes in our internal control over financial reporting that occurred during the quarter ending September 30, 2018, that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

Effective January 1, 2018, we adopted Accounting Standards Codification 606, “Revenue from Contracts with Customers.” Although the New Revenue Standard is not expected to have a material impact on our ongoing net income, changes were made to relevant business processes and the related control activities, including information systems, in order to monitor and maintain appropriate controls over financial reporting. The operating effectiveness of these changes will be evaluated as part of our annual assessment on the effectiveness of internal controls over financial reporting.

PART II. OTHER INFORMATION

Item 1. Legal Proceedings

We are subject to certain legal and administrative actions we consider routine to our business activities. We believe the ultimate outcome of any pending legal or administrative matters will not have a material adverse impact on our financial position, liquidity or results of operations.

Item 1A. Risk Factors

We have evaluated our risk factors and determined the following changes to those set forth in Part I, Item 1A of our Annual Report on Form 10-K.

If we finance the construction of Sunseeker Resort - Charlotte Harbor without the incurrence of debt at the subsidiary level, our balance sheet will be weakened if the airline does not generate sufficient cash flow for this purpose or if there are cost overruns.

We have announced we may finance the construction of Sunseeker Resort - Charlotte Harbor on our balance sheet without the incurrence of debt at the subsidiary level. To accomplish this, we will be using our cash balances and cash flow expected to be generated by our airline operations. Our balance sheet will be weakened if the airline does not produce sufficient cash flow for this purpose or if there are cost overruns. We have hired experienced construction management to mitigate the risk of cost overruns. In addition, we have indicated we would consider financing at the subsidiary level during or after construction. If we decide to secure debt at the subsidiary level, these cash flow and balance sheet risks will be mitigated to the extent of any financing funded.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

Our Repurchases of Equity Securities

The following table reflects the repurchases of our common stock during the third quarter 2018:



Period	Total Number of Shares Purchased (1)	Average Price Paid per Share		Total Number of Shares Purchased as Part of our Publicly Announced Plan	Approximate Dollar Value of Shares that May Yet be Purchased Under the Plans or Programs (in thousands) (2)
July	783	$	130.30	None
August	—	—		None
September	3,935	132.55		None
Total	4,718	$	132.18		$	100,000

(1) Includes shares repurchased from employees who vested a portion of their restricted stock grants. These share 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 income tax withholding requirements.

(2) Represents the remaining dollar amount of open market purchases of our common stock which has been authorized by the Board under a share repurchase program.

Item 3. Defaults Upon Senior Securities

None

Item 4. Mine Safety Disclosures

Not applicable

Item 5. Other Information

None

Item 6. Exhibits



3.1	Articles of Incorporation (1)
3.2	Bylaws of the Company as amended on April 24, 2018 (2)
12	Calculation of Ratio of Earnings to Fixed Charges of Allegiant Travel Company
31.1	Rule 13a - 14(a) / 15d - 14(a) Certification of Principal Executive Officer
31.2	Rule 13a - 14(a) / 15d - 14(a) Certification of Principal Financial Officer
32	Section 1350 Certifications
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 Labels Linkbase Document
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document

(1) Incorporated by reference to Exhibit filed with Registration Statement #333-134145 filed by the Company with the Commission and amendments thereto.

(2) Incorporated by reference to Exhibit 3.1 to the Current Report on Form 8-K filed with the Commission on April 25, 2018.

SIGNATURES

Pursuant to the requirements 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.



		ALLEGIANT TRAVEL COMPANY


Date:	October 31, 2018	By:	/s/ Scott Sheldon
		Scott Sheldon, as duly authorized officer of the Company (Chief Financial Officer) and as Principal Financial Officer



	Nine Months Ended September 30,
	2018
Earnings:
Income before income taxes	$	146,850
Add: Fixed Charges	43,244
Add: Amortization of capitalized interest	121
Less: Interest capitalized	279
Less: Earnings from joint venture, net	175
Total earnings	$	189,761

Fixed charges:
Interest costs (1)	$	40,467
Interest factor of operating lease expense (2)	2,777
Total fixed charges	$	43,244

Ratio of earnings to fixed charges (3)	4.39

Document And Entity Information - shares	9 Months Ended
Document And Entity Information - shares	Sep. 30, 2018	Oct. 26, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	Allegiant Travel CO
Document Type	10-Q
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		16,159,816
Amendment Flag	false
Entity Central Index Key	0001362468
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3

Summary of Significant Accounting Policies	9 Months Ended
Summary of Significant Accounting Policies	Sep. 30, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation The accompanying unaudited consolidated financial statements include the accounts of Allegiant Travel Company (the “Company”) and its majority-owned operating subsidiaries. The Company has no independent operations, and all guarantees of the Company's publicly held debt are full and unconditional and joint and several. Any subsidiaries of the parent company other than the subsidiary guarantors are minor. All intercompany balances and transactions have been eliminated. These unaudited consolidated financial statements reflect all normal recurring adjustments which management believes are necessary to present fairly the financial position, results of operations, and cash flows of the Company for the respective periods presented. Certain reclassifications have been made to prior year financial statements to conform to classifications used in the current year. Certain information and footnote disclosures normally included in the annual consolidated financial statements prepared in accordance with U.S. generally accepted accounting principles ("U.S. GAAP") have been omitted pursuant to the rules and regulations of the Securities and Exchange Commission for Form 10-Q. These unaudited interim consolidated financial statements should be read in conjunction with the audited consolidated financial statements of the Company and notes thereto included in the annual report of the Company on Form 10-K for the year ended December 31, 2017 and filed with the Securities and Exchange Commission. The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, and disclosure of contingent assets and liabilities, at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results may differ from these estimates. Recent Accounting Pronouncements Standards Effective in Future Years In February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards update ("ASU") 2016-02, "Leases (topic 842)." This standard will require certain leases with durations greater than twelve months to be recognized on the balance sheet as a lease liability and a corresponding right-of-use asset, and is effective for interim and annual reporting periods beginning after December 15, 2018 with early adoption permitted. The Company will adopt this standard effective January 1, 2019. In July 2018, the FASB issued ASU 2018-11, "Targeted Improvements - Leases (Topic 842)." This update provides an optional transition method that allows entities to elect to apply the standard prospectively at the adoption date, versus recasting the prior periods presented. If elected, the Company will recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The Company has not completed the assessment of this new standard but believes adoption will have a significant impact on its consolidated balance sheets due to the recognition of right-of-use assets and lease liabilities for certain leases currently accounted for as operating leases. It is not expected to significantly change the recognition, measurement or presentation of associated expenses within the consolidated statements of income or cash flows. Recently Adopted Standards In February 2018, the FASB issued ASU 2018-02, "Income Statement—Reporting Comprehensive Income (Topic 220)." This standard provides an option to reclassify stranded tax effects within accumulated other comprehensive income (loss) ("AOCI") to retained earnings. The Company adopted this standard effective January 1, 2018 and a one-time effect of $0.6 million has been reclassified from AOCI to retained earnings. In 2014, the FASB issued ASU 2014-09, "Revenue from Contracts with Customers (Topic 606)" (the "New Revenue Standard"). Under this ASU and subsequently issued amendments, revenue is recognized at the time a good or service is transferred to a customer for the amount of consideration received. Entities may use a full retrospective approach or report the cumulative effect as of the date of adoption. The Company adopted this standard using the full retrospective transition method effective January 1, 2018 and recast prior year results. See Note 2, "Revenue Recognition" for more information on the financial impact of this adoption. Under the New Revenue Standard, revenue for all Air-related ancillary fees that are directly related to ticket revenue, such as seat fees and baggage fees, are no longer considered distinct performance obligations separate from passenger travel and are reclassified into passenger revenue. These are deemed part of the single performance obligation of providing passenger transportation. While the adoption of the New Revenue Standard did not have a significant effect on earnings, $150.1 million and $472.4 million of Air-related ancillary fees for the three and nine months ended September 30, 2018, respectively, are now classified as passenger revenue. The adoption of the New Revenue Standard resulted in a net reduction to air traffic liability at December 31, 2017 of $5.9 million. This change resulted from the recognition of breakage revenue on issuance of credit vouchers that are expected to expire unused. In addition, recognition of revenues for fees associated with flight changes or cancellations are now deferred until the time of flight rather than being recognized at the time the fee is incurred. The Company recognizes revenue from the co-branded credit card program on the deferral method. Bank of America has issued The Allegiant World Mastercard® in which points are earned and awarded to cardholders in exchange for consideration received under an agreement with a seven year scheduled duration expiring in 2023. Under this arrangement, the Company identified the following deliverables: travel points to be awarded (the travel component), use of the Company’s brand and access to its member lists, and certain other advertising and marketing elements (collectively the marketing component). Consideration received from the Company’s co-brand agreement is allocated between the two components based on the relative selling price of each deliverable. The Company applies a level of management judgment and estimation in determining the best estimate of selling price for each deliverable by considering multiple inputs and methods including, but not limited to, the redemption value of points awarded, discounted cash flows, brand value, volume discounts, published selling prices, number of points to be awarded and number of points to be redeemed.

Related Party	9 Months Ended
Related Party	Sep. 30, 2018
Related Party Transactions [Abstract]
Related Party Transactions Disclosure	Related Party Transactions During the three and nine months ended September 30, 2018, no related party transactions occurred requiring disclosure. Entities owned or controlled by the Company's Chairman and CEO have been paid for the building of corporate training content. During the nine months ended September 30, 2017, the Company made payments to these entities of $0.2 million. No further payments are expected.

Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2018
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Subsequent Events In October 2018, the Company executed a purchase agreement for one Airbus A320 series aircraft, for which delivery is expected in the second quarter 2019. Also in October 2018, the remaining $19.5 million was borrowed under a senior secured credit facility entered into by the Company in September, which is secured by one Airbus A320 series aircraft.


(1)	Interest costs include both interest expensed and capitalized, including amortization of deferred financing costs and original issue discount on debt.


(3)	The ratio of earnings to fixed charges was computed by dividing earnings by fixed charges.



Date:	October 31, 2018	/s/ Maurice J. Gallagher, Jr.
		Title: Principal Executive Officer



/s/ Maurice J. Gallagher, Jr.		/s/ Scott Sheldon
Maurice J. Gallagher, Jr.		Scott Sheldon
Principal Executive Officer		Principal Financial Officer
October 31, 2018		October 31, 2018

Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Common Stock, Par or Stated Value Per Share	$ 0.001
CURRENT ASSETS
Cash and cash equivalents	$ 140,752	$ 59,449
Restricted cash	20,317	11,190
Short-term investments	284,616	352,681
Accounts receivable	33,672	71,057
Expendable parts, supplies and fuel, net	23,790	17,647
Prepaid expenses	30,640	23,931
Other current assets	129	5,320
TOTAL CURRENT ASSETS	533,916	541,275
Property and equipment, net	1,816,805	1,512,415
Long-term investments	53,353	78,570
Deferred major maintenance, net	44,402	31,326
Deposits and other assets	32,019	16,571
TOTAL ASSETS:	2,480,495	2,180,157
CURRENT LIABILITIES
Accounts payable	17,299	20,108
Accrued liabilities	110,705	105,127
Air traffic liability	231,731	204,299
Current maturities of long-term debt and capital lease obligations, net of related costs	654,697	214,761
TOTAL CURRENT LIABILITIES	1,014,432	544,295
Long-term debt and capital lease obligations, net of current maturities and related costs	658,352	950,131
Deferred income taxes	140,555	119,013
Other noncurrent liabilities	14,160	13,407
TOTAL LIABILITIES:	1,827,499	1,626,846
SHAREHOLDERS' EQUITY
Common stock, par value $.001	23	23
Treasury stock	(607,649)	(605,655)
Additional paid in capital	266,907	253,840
Accumulated other comprehensive loss, net	(1,227)	(2,840)
Retained earnings	994,942	907,943
TOTAL EQUITY:	652,996	553,311
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY:	$ 2,480,495	$ 2,180,157

Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Cash dividends declared per share:	$ 0.70	$ 0.70	$ 2.10	$ 2.10
OPERATING REVENUE:
Passenger revenue	$ 355,100	$ 315,308	$ 1,157,443	$ 1,030,395
Third party products	15,921	12,348	44,045	39,394
Fixed fee contract revenue	14,791	11,831	33,000	34,120
Other revenue	7,297	10,708	20,845	28,140
Total operating revenue	393,109	350,195	1,255,333	1,132,049
OPERATING EXPENSES:
Aircraft fuel	113,525	80,421	342,006	250,470
Salary and benefits	97,706	88,788	312,314	277,307
Station operations	43,128	37,148	122,265	107,979
Maintenance and repairs	31,983	28,870	75,864	87,611
Depreciation and amortization	34,658	31,894	92,641	92,571
Sales and marketing	16,798	13,884	54,224	40,707
Aircraft lease rentals	671	533	767	3,098
Other	28,459	24,315	74,881	68,440
Total operating expenses	366,928	305,853	1,074,962	928,183
OPERATING INCOME	26,181	44,342	180,371	203,866
OTHER (INCOME) EXPENSE:
Interest expense	14,309	10,041	40,188	27,332
Interest income	(2,425)	(1,454)	(6,259)	(4,193)
Other, net	(118)	(400)	(408)	(1,254)
Total other expense	11,766	8,187	33,521	21,885
INCOME BEFORE INCOME TAXES	14,415	36,155	146,850	181,981
PROVISION FOR INCOME TAXES	(732)	12,771	26,494	67,208
NET INCOME	$ 15,147	$ 23,384	$ 120,356	$ 114,773
Earnings per share to common shareholders:
Basic	$ 0.94	$ 1.45	$ 7.46	$ 7.00
Earnings Per Share, Diluted	$ 0.94	$ 1.45	$ 7.45	$ 6.99
Shares used for computation:
Basic	15,957,000	15,852,000	15,929,000	16,142,000
Diluted	15,962,000	15,862,000	15,938,000	16,160,000

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Adjustments to reconcile net income to net cash provided by operating activities:
Net income	$ 120,356	$ 114,773
Depreciation and amortization	92,641	92,571
(Gain) loss on aircraft and other equipment disposals	2,274	6,619
Share-based compensation expense	11,043	10,847
Deferred income taxes	21,760	64,788
Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities	1,833	3,959
Changes in certain assets and liabilities:
(Increase) decrease in accounts receivable	38,005	17,709
(Increase) decrease in prepaid expenses	(6,709)	(8,825)
Increase (decrease) in accounts payable	(2,437)	3,671
Increase (decrease) in accrued liabilities	5,960	(11,183)
Increase (Decrease) in Air Traffic Liability	27,432	27,688
Change in deferred major maintenance	(21,699)	(14,779)
Other operating activities	(336)	(5,756)
Net cash provided by operating activities	290,123	302,082
INVESTING ACTIVITIES:
Purchase of investment securities	(263,057)	(273,796)
Proceeds from maturities of investment securities	355,325	239,920
Purchase of property and equipment, including capitalized interest	(273,999)	(333,746)
Other investing activities	(5,399)	1,338
Net cash used in investing activities	(187,130)	(366,284)
FINANCING ACTIVITIES:
Cash dividends paid to shareholders	(33,919)	(34,462)
Proceeds from the issuance of debt	191,724	292,540
Repurchase of common stock	(3,617)	(90,445)
Principal payments on debt and capital lease obligations	(171,438)	(88,026)
Other financing activities	4,687	(405)
Net cash (used in) provided by financing activities	(12,563)	79,202
Net change in cash, cash equivalents, and restricted cash	90,430	15,000
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT BEGINNING OF PERIOD	70,639	76,358
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT END OF PERIOD	161,069	91,358
CASH PAYMENTS FOR:
Interest paid, net of amount capitalized	43,751	31,733
Income tax refunds	$ 41,145	$ 18,757

Consolidated Statements of Cash Flows (Unaudited) Reconciliation of Cash, Cash Equivalents, and Restricted Cash - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Consolidated Statements of Cash Flows (Parenthetical) [Abstract]
Cash and cash equivalents	$ 140,752	$ 59,449	$ 74,023
Restricted cash	20,317	11,190	17,335
TOTAL CASH, CASH EQUIVALENTS AND RESTRICTED CASH	$ 161,069	$ 70,639	$ 91,358	$ 76,358

Long-Term Debt Schedule of Maturities (Tables)	9 Months Ended
Long-Term Debt Schedule of Maturities (Tables)	Sep. 30, 2018
Schedule of Maturities of Long-Term Debt [Abstract]
Schedule of Maturities of Long-term Debt	Maturities of long-term debt and capital lease obligations for the remainder of 2018 and for the next five years and thereafter, in the aggregate, are: remaining in 2018 - $114.6 million; 2019 - $570.2 million; 2020 - $118.6 million; 2021 - $91.9 million; 2022 - $64.5 million; and $353.2 million thereafter.

Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Revenue Recognition (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Passenger revenue	$ 355,100	$ 315,308	$ 1,157,443	$ 1,030,395
Scheduled Service Revenue
Disaggregation of Revenue [Line Items]
Passenger revenue	202,796	183,294	677,061	618,368
Air-related revenue
Disaggregation of Revenue [Line Items]
Passenger revenue	150,095	131,388	472,443	410,500
Co-brand Revenue
Disaggregation of Revenue [Line Items]
Passenger revenue	$ 2,209	626	$ 7,939	1,527
Calculated under Revenue Guidance in Effect before Topic 606
Disaggregation of Revenue [Line Items]
Passenger revenue		183,064		615,777
Air-related charges		$ 130,818		$ 407,789

Revenue Recognition Points Liability (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)
Points Liability [Abstract]
Points Liability Start of Period	$ 8,903
Points awarded	10,872
Points redeemed	(7,939)
Contract with Customer, Liability	11,836
Points Liability	$ 8,100

Revenue Recognition Passenger Revenue (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Revenue Recognition [Abstract]
Increase (Decrease) in Deferred Air Traffic Revenue	$ 192,600
Air traffic liability	$ 231,731	$ 204,299

Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Flight equipment, including pre-delivery deposits	$ 1,867,655	$ 1,539,433
Computer hardware and software	137,110	123,675
Land and buildings/leasehold improvements	88,882	77,409
Other property and equipment	75,529	48,446
Total property and equipment	2,169,176	1,788,963
Less accumulated depreciation and amortization	352,371	276,548
Property and equipment, net	$ 1,816,805	$ 1,512,415

Long-Term Debt Components of Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Notes Payable	$ 1,193,557	$ 1,171,002
Secured Long-term Debt, Noncurrent	1,313,049	1,164,892
Less current maturities	654,697	214,761
Long-term debt and capital leases, net of current maturities and related costs	658,352	950,131
Fixed-rate debt and capital lease obligations due through 2030
Debt Instrument [Line Items]
Notes Payable	644,116	465,462
Variable-rate debt due through 2028
Debt Instrument [Line Items]
Notes Payable	$ 668,933	$ 699,430
Weighted average fixed-interest rate on debt
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate, at Point in Time	5.30%	5.40%
Weighted average variable-interest rate on debt
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate, at Point in Time	4.00%	3.30%

Long-Term Debt (Details) - USD ($) $ in Thousands		1 Months Ended	9 Months Ended
Long-Term Debt (Details) - USD ($) $ in Thousands	Oct. 01, 2018	Dec. 31, 2016	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Dec. 01, 2016	Dec. 31, 2015	Jun. 01, 2014
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year			$ 114,600
Long-term Debt, Maturities, Repayments of Principal in Year Two			570,200
Long-term Debt, Maturities, Repayments of Principal in Year Three			118,600
Long-term Debt, Maturities, Repayments of Principal in Year Four			91,900
Long-term Debt, Maturities, Repayments of Principal in Year Five			64,500
Long-term Debt, Maturities, Repayments of Principal after Year Five			353,200
Secured Long-term Debt, Noncurrent			1,313,049			$ 1,164,892
Consolidated Variable Interest Entity
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities			44,000
Variable Interest Entity, Consolidated, Carrying Amount, Assets			$ 37,800
Debt, Weighted Average Interest Rate			4.00%
Senior Secured Revolving Credit Facility
Line of Credit Facility, Maximum Borrowing Capacity					$ 81,000			$ 56,000
Line of Credit Facility, Fair Value of Amount Outstanding			$ 46,900
Secured Debt September 2018
Debt Instrument, Face Amount			55,500
Line of Credit Facility, Maximum Borrowing Capacity			75,000
Secured Debt July 2018
Debt Instrument, Face Amount			34,500
Secured Debt June 2018
Debt Instrument, Face Amount			$ 10,800
Debt Instrument, Interest Rate, Stated Percentage			4.20%
Unsecured Debt
Unsecured Long-term Debt, Noncurrent							$ 150,000		$ 300,000
Debt Instrument, Redemption Price, Percentage		101.50%
Debt Instrument, Interest Rate, Stated Percentage				5.50%
Airbus A320 Aircraft Series \| Consolidated Variable Interest Entity
Debt Instrument, Collateral			1
Airbus A320 Aircraft Series \| Secured Debt September 2018
Debt Instrument, Collateral			3
Airbus A320 Aircraft Series \| Secured Debt July 2018
Debt Instrument, Collateral			1
Subsequent Event [Member]
Debt Instrument, Face Amount	$ 19,500
Subsequent Event [Member] \| Airbus A320 Aircraft Series
Debt Instrument, Collateral	1

Fair Value Measurements (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Measurements, Recurring
Available-for-sale Securities	$ 427,406	$ 463,522
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 1
Available-for-sale Securities	45,227	1,297
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 2
Available-for-sale Securities	382,179	462,225
Short-term Investments \| Fair Value, Measurements, Recurring
Available-for-sale Securities	284,616	352,681
Short-term Investments \| Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 1
Available-for-sale Securities	0	0
Short-term Investments \| Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 2
Available-for-sale Securities	284,616	352,681
Short-term Investments \| Fair Value, Measurements, Recurring \| Commercial paper
Available-for-sale Securities	143,961	108,678
Short-term Investments \| Fair Value, Measurements, Recurring \| Commercial paper \| Fair Value, Inputs, Level 1
Available-for-sale Securities	0	0
Short-term Investments \| Fair Value, Measurements, Recurring \| Commercial paper \| Fair Value, Inputs, Level 2
Available-for-sale Securities	143,961	108,678
Short-term Investments \| Fair Value, Measurements, Recurring \| Federal agency debt securities
Available-for-sale Securities	12,227	31,428
Short-term Investments \| Fair Value, Measurements, Recurring \| Federal agency debt securities \| Fair Value, Inputs, Level 1
Available-for-sale Securities	0	0
Short-term Investments \| Fair Value, Measurements, Recurring \| Federal agency debt securities \| Fair Value, Inputs, Level 2
Available-for-sale Securities	12,227	31,428
Short-term Investments \| Fair Value, Measurements, Recurring \| Municipal debt securities
Available-for-sale Securities	27,191	101,290
Short-term Investments \| Fair Value, Measurements, Recurring \| Municipal debt securities \| Fair Value, Inputs, Level 1
Available-for-sale Securities	0	0
Short-term Investments \| Fair Value, Measurements, Recurring \| Municipal debt securities \| Fair Value, Inputs, Level 2
Available-for-sale Securities	27,191	101,290
Short-term Investments \| Fair Value, Measurements, Recurring \| Corporate debt securities
Available-for-sale Securities	99,556	107,878
Short-term Investments \| Fair Value, Measurements, Recurring \| Corporate debt securities \| Fair Value, Inputs, Level 1
Available-for-sale Securities	0	0
Short-term Investments \| Fair Value, Measurements, Recurring \| Corporate debt securities \| Fair Value, Inputs, Level 2
Available-for-sale Securities	99,556	107,878
Short-term Investments \| Fair Value, Measurements, Recurring \| US Treasury Securities
Available-for-sale Securities	1,681	3,407
Short-term Investments \| Fair Value, Measurements, Recurring \| US Treasury Securities \| Fair Value, Inputs, Level 1
Available-for-sale Securities	0	0
Short-term Investments \| Fair Value, Measurements, Recurring \| US Treasury Securities \| Fair Value, Inputs, Level 2
Available-for-sale Securities	1,681	3,407
Long Term Investments \| Municipal debt securities \| Fair Value, Inputs, Level 1
Available-for-sale Securities	0	0
Long Term Investments \| Municipal debt securities \| Fair Value, Inputs, Level 2
Available-for-sale Securities	0	9,405
Long Term Investments \| Fair Value, Measurements, Recurring
Available-for-sale Securities	53,353	78,852
Long Term Investments \| Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 1
Available-for-sale Securities	0	0
Long Term Investments \| Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 2
Available-for-sale Securities	53,353	78,852
Long Term Investments \| Fair Value, Measurements, Recurring \| Federal agency debt securities
Available-for-sale Securities	10,026	5,775
Long Term Investments \| Fair Value, Measurements, Recurring \| Federal agency debt securities \| Fair Value, Inputs, Level 1
Available-for-sale Securities	0	0
Long Term Investments \| Fair Value, Measurements, Recurring \| Federal agency debt securities \| Fair Value, Inputs, Level 2
Available-for-sale Securities	10,026	5,775
Long Term Investments \| Fair Value, Measurements, Recurring \| Municipal debt securities
Available-for-sale Securities	0	9,405
Long Term Investments \| Fair Value, Measurements, Recurring \| Corporate debt securities
Available-for-sale Securities	40,343	60,396
Long Term Investments \| Fair Value, Measurements, Recurring \| Corporate debt securities \| Fair Value, Inputs, Level 1
Available-for-sale Securities	0	0
Long Term Investments \| Fair Value, Measurements, Recurring \| Corporate debt securities \| Fair Value, Inputs, Level 2
Available-for-sale Securities	40,343	60,396
Long Term Investments \| Fair Value, Measurements, Recurring \| US Treasury Securities
Available-for-sale Securities	2,984	2,994
Long Term Investments \| Fair Value, Measurements, Recurring \| US Treasury Securities \| Fair Value, Inputs, Level 1
Available-for-sale Securities	0	0
Long Term Investments \| Fair Value, Measurements, Recurring \| US Treasury Securities \| Fair Value, Inputs, Level 2
Available-for-sale Securities	2,984	2,994
Long Term Investments \| Fair Value, Measurements, Recurring \| Derivative Financial Instruments, Assets
Available-for-sale Securities	0	282
Long Term Investments \| Fair Value, Measurements, Recurring \| Derivative Financial Instruments, Assets \| Fair Value, Inputs, Level 1
Available-for-sale Securities	0	0
Long Term Investments \| Fair Value, Measurements, Recurring \| Derivative Financial Instruments, Assets \| Fair Value, Inputs, Level 2
Available-for-sale Securities	0	282
Cash Equivalents \| Fair Value, Measurements, Recurring
Cash Equivalents	89,437	31,989
Cash Equivalents \| Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 1
Cash Equivalents	45,227	1,297
Cash Equivalents \| Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 2
Cash Equivalents	44,210	30,692
Cash Equivalents \| Fair Value, Measurements, Recurring \| US Treasury Bonds
Cash Equivalents	45,227	1,297
Cash Equivalents \| Fair Value, Measurements, Recurring \| US Treasury Bonds \| Fair Value, Inputs, Level 1
Cash Equivalents	45,227	1,297
Cash Equivalents \| Fair Value, Measurements, Recurring \| US Treasury Bonds \| Fair Value, Inputs, Level 2
Cash Equivalents	0	0
Cash Equivalents \| Fair Value, Measurements, Recurring \| Commercial paper
Cash Equivalents	42,157	27,910
Cash Equivalents \| Fair Value, Measurements, Recurring \| Commercial paper \| Fair Value, Inputs, Level 1
Cash Equivalents	0	0
Cash Equivalents \| Fair Value, Measurements, Recurring \| Commercial paper \| Fair Value, Inputs, Level 2
Cash Equivalents	42,157	27,910
Cash Equivalents \| Fair Value, Measurements, Recurring \| Municipal debt securities
Cash Equivalents	2,053	2,782
Cash Equivalents \| Fair Value, Measurements, Recurring \| Municipal debt securities \| Fair Value, Inputs, Level 1
Cash Equivalents	0	0
Cash Equivalents \| Fair Value, Measurements, Recurring \| Municipal debt securities \| Fair Value, Inputs, Level 2
Cash Equivalents	$ 2,053	$ 2,782

Fair Value Measurements Estimated Fair Value of Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Secured Long-term Debt, Noncurrent	$ 1,313,049	$ 1,164,892
Notes Payable	1,193,557	1,171,002
Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Secured Long-term Debt, Noncurrent	1,119,525	1,122,669
Publicly Held Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Secured Long-term Debt, Noncurrent	450,679	451,321
Publicly Held Debt \| Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Secured Long-term Debt, Noncurrent	455,749	462,604
Non-Publicly Held Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Secured Long-term Debt, Noncurrent	742,878	719,681
Non-Publicly Held Debt \| Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Secured Long-term Debt, Noncurrent	$ 663,776	$ 660,065

Commitments and Contingencies (Details) $ in Thousands	9 Months Ended
Commitments and Contingencies (Details) $ in Thousands	Sep. 30, 2018 USD ($) aircraft
Long-term Purchase Commitment [Line Items]
Number Of Aircraft Committed To Purchase \| aircraft	10
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	$ 44,154
Unrecorded Unconditional Purchase Obligation, Due within Two Years	116,322
Unrecorded Unconditional Purchase Obligation, Due within Three Years	62,382
Unrecorded Unconditional Purchase Obligation, Due within Four Years	21,248
Unrecorded Unconditional Purchase Obligation, Due within Five Years	19,159
Unrecorded Unconditional Purchase Obligation, Due after Five Years	122,414
Unrecorded Unconditional Purchase Obligation	$ 385,679
Airbus A320 Aircraft Series
Long-term Purchase Commitment [Line Items]
Number of Aircraft Committed to be Leased \| aircraft	12
Airbus A320 Aircraft Series, In Service
Long-term Purchase Commitment [Line Items]
Aircraft acquired \| aircraft	4
Airbus A320 Aircraft Series, Not In Service
Long-term Purchase Commitment [Line Items]
Aircraft acquired \| aircraft	1

Commitments and Contingencies Payments Related to Commitments to Purchase (Details) $ in Thousands	Sep. 30, 2018 USD ($)
Payments Related to Commitments to Purchase [Abstract]
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	$ 44,154
Unrecorded Unconditional Purchase Obligation, Due within Two Years	116,322
Unrecorded Unconditional Purchase Obligation, Due within Three Years	62,382
Unrecorded Unconditional Purchase Obligation, Due within Four Years	21,248
Unrecorded Unconditional Purchase Obligation, Due within Five Years	19,159
Unrecorded Unconditional Purchase Obligation, Due after Five Years	122,414
Unrecorded Unconditional Purchase Obligation	$ 385,679

Related Party (Details) $ in Millions	9 Months Ended
Related Party (Details) $ in Millions	Sep. 30, 2017 USD ($)
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction	$ 0.2

Subsequent Events (Details) $ in Millions	Oct. 01, 2018 USD ($) aircraft	Sep. 30, 2018 aircraft
Subsequent Event [Line Items]
Number Of Aircraft Committed To Purchase		10
Subsequent Event [Member]
Subsequent Event [Line Items]
Debt Instrument, Face Amount \| $	$ 19.5
Airbus A320 Aircraft Series \| Subsequent Event [Member]
Subsequent Event [Line Items]
Number Of Aircraft Committed To Purchase	1
Debt Instrument, Collateral	1