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REVENUE RECOGNITION - Passenger Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Passenger revenue	$ 16,673	$ 15,677	$ 47,361	$ 46,084
Passenger
Disaggregation of Revenue [Line Items]
Passenger revenue	13,506	13,107	38,852	38,079
Ticket
Disaggregation of Revenue [Line Items]
Passenger revenue	11,859	11,645	34,173	33,827
Loyalty travel awards
Disaggregation of Revenue [Line Items]
Passenger revenue	1,108	978	3,140	2,798
Travel-related services
Disaggregation of Revenue [Line Items]
Passenger revenue	$ 539	$ 484	$ 1,539	$ 1,454

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