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REVENUE RECOGNITION - Passenger Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Passenger revenue	$ 14,040	$ 13,748
Passenger
Disaggregation of Revenue [Line Items]
Passenger revenue	11,480	11,131
Ticket
Disaggregation of Revenue [Line Items]
Passenger revenue	10,068	9,833
Loyalty travel awards
Disaggregation of Revenue [Line Items]
Passenger revenue	940	844
Travel-related services
Disaggregation of Revenue [Line Items]
Passenger revenue	$ 472	$ 454

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