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Revenue Recognition (Tables)
 3 Months Ended
Mar. 31, 2020
Revenue from Contract with Customer [Abstract]  
Schedule of disaggregation of revenue
Passenger Revenue

Passenger revenue is primarily composed of passenger ticket sales, loyalty travel awards and travel-related services performed in conjunction with a passenger’s flight.
Three Months Ended March 31,
(in millions)20202019
Ticket$6,511  $7,988  
Loyalty travel awards543  692  
Travel-related services515  574  
Total passenger revenue$7,569  $9,254  
Other Revenue
Three Months Ended March 31,
(in millions)20202019
Loyalty program$474  $474  
Ancillary businesses and refinery223  369  
Miscellaneous174  183  
Total other revenue$871  $1,026  
Schedule of activity in loyalty liability
The table below presents the activity of the current and noncurrent loyalty program liability and includes miles earned through travel and miles sold to participating companies, which are primarily through marketing agreements.
(in millions)20202019
Balance at January 1$6,728  $6,641  
Miles earned660  720  
Travel miles redeemed(543) (692) 
Non-travel miles redeemed(28) (45) 
Balance at March 31$6,817  $6,624  
Schedule of revenue by geographic region Our passenger and operating revenue by geographic region is summarized in the following tables:
Passenger Revenue
Three Months Ended March 31,
(in millions)20202019
Domestic$5,601  $6,741  
Atlantic818  1,074  
Latin America765  861  
Pacific385  578  
Total$7,569  $9,254  

Operating Revenue
Three Months Ended March 31,
(in millions)20202019
Domestic$6,267  $7,516  
Atlantic994  1,287  
Latin America863  969  
Pacific468  700  
Total$8,592  $10,472