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Revenue Recognition (Tables)
 3 Months Ended
Mar. 31, 2022
Revenue from Contract with Customer [Abstract]  
Schedule of disaggregation of revenue 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 
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 
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)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 
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)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