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REVENUE RECOGNITION (Tables)
 3 Months Ended
Mar. 31, 2023
Revenue from Contract with Customer [Abstract]  
Schedule of disaggregation of revenue
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 
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 
Schedule of activity in loyalty program deferred revenue
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 
Schedule of revenue by geographic 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