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Revenue (Tables)
 3 Months Ended
Mar. 31, 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 March 31,
20222021
Domestic (U.S. and Canada)$5,086 $2,111 
Atlantic1,089 410 
Latin America909 392 
Pacific482 308 
Total$7,566 $3,221 
Roll Forward of Frequent Flyer Deferred Revenue The table below presents a roll forward of Frequent flyer deferred revenue (in millions):
Three Months Ended March 31,
20222021
Total Frequent flyer deferred revenue - beginning balance$6,282 $5,975 
Total miles awarded477 272 
Travel miles redeemed(322)(123)
Non-travel miles redeemed(20)(15)
Total Frequent flyer deferred revenue - ending balance$6,417 $6,109