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REVENUE RECOGNITION (Tables)
 3 Months Ended
Mar. 31, 2024
Revenue from Contract with Customer [Abstract]  
Schedule of disaggregation of revenue
Passenger Revenue
Three Months Ended March 31,
(in millions)20242023
Ticket$9,833 $9,239 
Loyalty travel awards844 743 
Travel-related services454 429 
Passenger revenue$11,131 $10,411 
Other Revenue
Three Months Ended March 31,
(in millions)20242023
Refinery$1,185 $916 
Loyalty program795 726 
Ancillary businesses180 231 
Miscellaneous279 266 
Other revenue$2,439 $2,139 
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)20242023
Balance at January 1$8,420 $7,882 
Miles earned1,021 999 
Miles redeemed for air travel(844)(743)
Miles redeemed for non-air travel and other(56)(40)
Balance at March 31
$8,541 $8,098 
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
Three Months Ended March 31,
(in millions)20242023
Domestic$7,983 $7,594 
Atlantic1,305 1,244 
Latin America1,265 1,132 
Pacific578 441 
Total$11,131 $10,411 

Operating revenue by geographic region
Three Months Ended March 31,
(in millions)20242023
Domestic$10,031 $9,396 
Atlantic1,581 1,548 
Latin America1,442 1,280 
Pacific694 535 
Total$13,748 $12,759