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REVENUE RECOGNITION - Passenger Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Passenger revenue	$ 16,648	$ 16,658	$ 30,688	$ 30,406
Passenger
Disaggregation of Revenue [Line Items]
Passenger revenue	13,867	13,841	25,347	24,972
Ticket
Disaggregation of Revenue [Line Items]
Passenger revenue	12,246	12,349	22,314	22,182
Loyalty travel awards
Disaggregation of Revenue [Line Items]
Passenger revenue	1,092	975	2,033	1,820
Travel-related services
Disaggregation of Revenue [Line Items]
Passenger revenue	$ 529	$ 517	$ 1,000	$ 970

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