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Revenue Recognition
 3 Months Ended
Mar. 31, 2022
Revenue from Contract with Customer [Abstract]  
Revenue Recognition REVENUE RECOGNITION
Passenger Revenue
Three Months Ended March 31,
(in millions)20222021
Ticket$5,986 $2,277 
Loyalty travel awards543 241 
Travel-related services378 230 
Total passenger revenue$6,907 $2,748 

Ticket

We recognized approximately $2.2 billion and $822 million in passenger revenue during the three months ended March 31, 2022 and 2021, respectively, that had been recorded in our air traffic liability balance at the beginning of those periods.

In order to provide our customers more flexibility and time to plan or rebook their travel, in January 2022, we announced that all existing travel credit holders will have until December 31, 2023 to rebook their ticket for travel throughout 2024. Additionally, all Delta customers with upcoming 2022 travel or who purchase a ticket in 2022 will also have the flexibility to rebook their ticket through December 31, 2023, and travel throughout 2024. The air traffic liability classified as current as of March 31, 2022 represents our estimate of tickets and travel credits to be used within one year. We will continue to monitor our customers' travel behavior and may adjust our estimates in the future.

We estimate the value of tickets that will expire unused (“ticket breakage”) and recognize the related revenue at the scheduled flight date. Our ticket breakage estimates are primarily based on historical experience, ticket contract terms and customers’ travel behavior. Given the impact of the COVID-19 pandemic on customer behavior and changes made in ticket validity terms, as well as the elimination of change fees for most tickets, our estimates of revenue that will be recognized from the air traffic liability for unused tickets may vary in future periods.
Loyalty Travel Awards

Our SkyMiles loyalty program allows customers to earn mileage credits ("miles") by flying on Delta, Delta Connection and other airlines that participate in the loyalty program. Customers can also earn miles through participating companies, such as credit card companies, hotels, car rental agencies and ridesharing companies, who purchase miles from us. Our most significant contract to sell miles relates to our co-brand credit card relationship with American Express. During the three months ended March 31, 2022 and 2021, total cash sales from marketing agreements related to our loyalty program were $1.2 billion and $767 million, respectively, which are allocated to travel and other performance obligations. Loyalty travel awards revenue is related to the redemption of miles for air travel.

Current Activity of the Loyalty Program. Miles are combined in one homogeneous pool and are not separately identifiable. Therefore, revenue is comprised of miles that were part of the loyalty program deferred revenue balance at the beginning of the period as well as miles that were issued during the period. The timing of mile redemptions can vary widely; however, the majority of miles have historically been redeemed within two years of being earned.

The table below presents the activity of the current and noncurrent loyalty program deferred revenue and includes miles earned through travel and miles sold to participating companies, which are primarily through marketing agreements.

Loyalty program activity
(in millions)20222021
Balance at January 1$7,559 $7,182 
Miles earned658 354 
Miles redeemed for air travel(543)(241)
Miles redeemed for non-air travel and other(30)(10)
Balance at March 31
$7,644 $7,285 

Travel-Related Services

Travel-related services are primarily composed of services performed in conjunction with a passenger’s flight and include baggage fees, on-board sales and administrative fees.

Other Revenue
Three Months Ended March 31,
(in millions)20222021
Refinery$1,187 $540 
Loyalty program571 368 
Ancillary businesses209 186 
Miscellaneous185 93 
Total other revenue$2,152 $1,187 

Refinery. This represents refinery sales to third parties, which are at or near cost; accordingly, the margin on these sales is de minimis.

Loyalty Program. Loyalty program revenues relate to brand usage by third parties and other performance obligations embedded in miles sold, including redemption of miles for non-air travel and other awards. These revenues are mainly included within the total cash sales from marketing agreements, discussed above.

Ancillary Businesses. Ancillary businesses includes aircraft maintenance services we provide to third parties and our vacation wholesale operations.

Miscellaneous. Miscellaneous revenue is primarily composed of lounge access, including access provided to certain American Express cardholders, and codeshare revenues.
Revenue by Geographic Region

Operating revenue for the airline segment is recognized in a specific geographic region based on the origin, flight path and destination of each flight segment. A significant portion of the refinery segment's revenues typically consists of fuel sales to support the airline, which is eliminated in the Condensed Consolidated Financial Statements. The remaining operating revenue for the refinery segment is included in the domestic region. Our passenger and operating revenue by geographic region is summarized in the following tables:

Passenger revenue by geographic region
Passenger Revenue
Three Months Ended March 31,
(in millions)20222021
Domestic$5,563 $2,280 
Atlantic539 142 
Latin America680 264 
Pacific125 62 
Total$6,907 $2,748 

Operating revenue by geographic region
Operating Revenue
Three Months Ended March 31,
(in millions)20222021
Domestic$7,549 $3,368 
Atlantic776 267 
Latin America811 381 
Pacific212 134 
Total$9,348 $4,150