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Revenue Recognition (Tables)
 9 Months Ended
Sep. 30, 2021
Revenue from Contract with Customer [Abstract]  
Schedule of disaggregation of revenue Passenger Revenue
Three Months Ended September 30,
Nine Months Ended September 30,
(in millions)2021202020212020
Ticket$6,237 $1,634 $13,067 $8,712 
Loyalty travel awards544 143 1,213 731 
Travel-related services410 161 998 742 
Total passenger revenue$7,191 $1,938 $15,278 $10,185 
Other Revenue
Three Months Ended September 30,
Nine Months Ended September 30,
(in millions)2021202020212020
Refinery$872 $417 $2,189 $709 
Loyalty program453 343 1,260 1,086 
Ancillary businesses215 155 586 476 
Miscellaneous161 67 388 263 
Total other revenue$1,701 $982 $4,423 $2,534 
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)20212020
Balance at January 1$7,182 $6,728 
Miles earned1,541 1,132 
Miles redeemed for air travel(1,213)(731)
Miles redeemed for non-air travel and other(54)(40)
Balance at September 30
$7,456 $7,089 
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 September 30,
Nine Months Ended September 30,
(in millions)2021202020212020
Domestic$5,759 $1,647 $12,517 $7,812 
Atlantic730 132 1,160 1,014 
Latin America564 97 1,313 879 
Pacific138 62 288 480 
Total$7,191 $1,938 $15,278 $10,185 

Operating revenue by geographic region
Operating Revenue
Three Months Ended September 30,
Nine Months Ended September 30,
(in millions)2021202020212020
Domestic$7,311 $2,585 $16,572 $10,116 
Atlantic954 240 1,688 1,353 
Latin America653 126 1,620 1,015 
Pacific236 111 549 638 
Total$9,154 $3,062 $20,429 $13,122