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REVENUE RECOGNITION
 3 Months Ended
Mar. 31, 2023
Revenue from Contract with Customer [Abstract]  
REVENUE RECOGNITION REVENUE RECOGNITION
Passenger Revenue
Three Months Ended March 31,
(in millions)20232022
Ticket$9,239 $5,986 
Loyalty travel awards743 543 
Travel-related services429 378 
Total passenger revenue$10,411 $6,907 

Ticket

We recognized approximately $3.9 billion and $2.2 billion in passenger revenue during the three months ended March 31, 2023 and 2022, respectively, that had been recorded in our air traffic liability balance at the beginning of those periods.

As of March 31, 2023, our air traffic liability was recorded as a current liability. As of December 31, 2022, our air traffic liability was $8.3 billion, of which $100 million was included in other noncurrent liabilities on our Consolidated Balance Sheet ("balance sheet").

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. Loyalty travel awards revenue is related to the redemption of miles for air travel. 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, 2023 and 2022, total cash sales from marketing agreements related to our loyalty program were $1.7 billion and $1.2 billion, respectively, which are allocated to travel and other performance obligations.
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)20232022
Balance at January 1$7,882 $7,559 
Miles earned999 658 
Miles redeemed for air travel(743)(543)
Miles redeemed for non-air travel and other(40)(30)
Balance at March 31
$8,098 $7,644 

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)20232022
Refinery$916 $1,187 
Loyalty program726 571 
Ancillary businesses231 209 
Miscellaneous266 185 
Total other revenue$2,139 $2,152 

Refinery. This represents refinery sales to third parties. See Note 9, "Segments," for more information on revenue recognition within our refinery segment.

Loyalty Program. Loyalty program revenue relates 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 derived from the total cash sales from marketing agreements, discussed above.

Ancillary Businesses. Ancillary businesses revenue represents revenues from aircraft maintenance services we provide to third parties and our vacation wholesale operations.

Miscellaneous. Miscellaneous is primarily composed of revenues related to Delta Sky Club lounge access, including access provided to certain American Express cardholders, and codeshare agreements.
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)20232022
Domestic$7,594 $5,563 
Atlantic1,244 539 
Latin America1,132 680 
Pacific441 125 
Total$10,411 $6,907 

Operating revenue by geographic region
Operating Revenue
Three Months Ended March 31,
(in millions)20232022
Domestic$9,396 $7,549 
Atlantic1,548 776 
Latin America1,280 811 
Pacific535 212 
Total$12,759 $9,348