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Revenue (Tables)
 9 Months Ended
Sep. 30, 2022
Revenue from Contract with Customer [Abstract]  
Operating Revenue by Geographic Region The table below presents the Company's operating revenue by principal geographic region (as defined by the U.S. Department of Transportation) (in millions):
Three Months Ended September 30,Nine Months Ended
September 30,
2022202120222021
Domestic (U.S. and Canada)$7,718 $5,412 $20,623 $11,290 
Atlantic3,186 1,116 6,756 2,111 
Latin America1,162 849 3,266 1,968 
Pacific811 373 1,910 1,073 
Total$12,877 $7,750 $32,555 $16,442 
Roll Forward of Frequent Flyer Deferred Revenue The table below presents a roll forward of Frequent flyer deferred revenue (in millions):
Three Months Ended September 30,Nine Months Ended
September 30,
2022202120222021
Total Frequent flyer deferred revenue - beginning balance$6,495 $6,185 $6,282 $5,975 
Total miles awarded705 439 1,848 1,071 
Travel miles redeemed(601)(391)(1,489)(781)
Non-travel miles redeemed(21)(16)(63)(48)
Total Frequent flyer deferred revenue - ending balance$6,578 $6,217 $6,578 $6,217