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REVENUE RECOGNITION - Passenger Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Passenger revenue	$ 16,658	$ 15,578	$ 30,406	$ 28,337
Passenger
Disaggregation of Revenue [Line Items]
Passenger revenue	13,841	13,205	24,972	23,616
Ticket
Disaggregation of Revenue [Line Items]
Passenger revenue	12,349	11,829	22,182	21,068
Loyalty travel awards
Disaggregation of Revenue [Line Items]
Passenger revenue	975	902	1,820	1,645
Travel-related services
Disaggregation of Revenue [Line Items]
Passenger revenue	$ 517	$ 474	$ 970	$ 903

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