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Revenue Recognition (Tables)
 6 Months Ended
Jun. 30, 2021
Revenue from Contract with Customer [Abstract]  
Schedule of disaggregation of revenue Passenger Revenue
Three Months Ended June 30,
Six Months Ended June 30,
(in millions)2021202020212020
Ticket$4,553 $568 $6,830 $7,078 
Loyalty travel awards428 45 669 588 
Travel-related services358 65 588 581 
Total passenger revenue$5,339 $678 $8,087 $8,247 
Other Revenue
Three Months Ended June 30,
Six Months Ended June 30,
(in millions)2021202020212020
Ancillary businesses and refinery$962 $390 $1,688 $613 
Loyalty program439 269 807 743 
Miscellaneous135 23 228 196 
Total other revenue$1,536 $682 $2,723 $1,552 
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 earned915 872 
Travel miles redeemed(669)(588)
Non-travel miles redeemed(27)(31)
Balance at June 30
$7,401 $6,981 
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 June 30,
Six Months Ended June 30,
(in millions)2021202020212020
Domestic$4,478 $564 $6,758 $6,165 
Atlantic288 64 430 882 
Latin America485 18 749 783 
Pacific88 32 150 417 
Total$5,339 $678 $8,087 $8,247 

Operating revenue by geographic region
Operating Revenue
Three Months Ended June 30,
Six Months Ended June 30,
(in millions)2021202020212020
Domestic$5,894 $1,264 $9,262 $7,531 
Atlantic467 119 734 1,113 
Latin America586 26 967 889 
Pacific179 59 313 527 
Total$7,126 $1,468 $11,276 $10,060