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REVENUE RECOGNITION (Tables)
 9 Months Ended
Sep. 30, 2025
Revenue from Contract with Customer [Abstract]  
Schedule of Operating Revenue by Geographic Region The table below presents the Company's operating revenue by principal geographic region (in millions):
Three Months Ended September 30,Nine Months Ended September 30,
2025202420252024
Domestic (U.S. and Canada)$8,990 $8,648 $25,808 $25,082 
Atlantic3,486 3,432 8,755 8,542 
Pacific1,568 1,531 5,009 4,721 
Latin America1,181 1,232 4,100 4,023 
Total$15,225 $14,843 $43,673 $42,368 
Schedule of 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,
2025202420252024
Beginning Balance$7,665 $7,353 $7,441 $7,143 
Miles earned968 884 2,878 2,643 
Travel miles redeemed(896)(842)(2,514)(2,325)
Non-travel miles redeemed(36)(24)(103)(90)
Ending Balance$7,702 $7,371 $7,702 $7,371