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Revenue (Tables)
 6 Months Ended
Jun. 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 June 30,Six Months Ended June 30,
2022202120222021
Domestic (U.S. and Canada)$7,819 $3,767 $12,905 $5,878 
Atlantic2,481 585 3,570 995 
Latin America1,195 727 2,104 1,119 
Pacific617 392 1,099 700 
Total$12,112 $5,471 $19,678 $8,692 
Roll Forward of Frequent Flyer Deferred Revenue The table below presents a roll forward of Frequent flyer deferred revenue (in millions):
Three Months Ended June 30,Six Months Ended June 30,
2022202120222021
Total Frequent flyer deferred revenue - beginning balance$6,417 $6,109 $6,282 $5,975 
Total miles awarded666 360 1,143 632 
Travel miles redeemed(566)(267)(888)(390)
Non-travel miles redeemed(22)(17)(42)(32)
Total Frequent flyer deferred revenue - ending balance$6,495 $6,185 $6,495 $6,185