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REVENUE RECOGNITION - Revenue by Geographic Region (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]
Operating revenue	$ 16,658	$ 15,578	$ 30,406	$ 28,337
Domestic
Disaggregation of Revenue [Line Items]
Operating revenue	11,575	10,749	21,607	20,145
Atlantic
Disaggregation of Revenue [Line Items]
Operating revenue	3,210	3,178	4,791	4,726
Latin America
Disaggregation of Revenue [Line Items]
Operating revenue	1,102	1,037	2,543	2,317
Pacific
Disaggregation of Revenue [Line Items]
Operating revenue	771	614	1,465	1,149
Passenger
Disaggregation of Revenue [Line Items]
Operating revenue	13,841	13,205	24,972	23,616
Passenger | Domestic
Disaggregation of Revenue [Line Items]
Operating revenue	9,398	8,944	17,381	16,538
Passenger | Atlantic
Disaggregation of Revenue [Line Items]
Operating revenue	2,825	2,803	4,130	4,047
Passenger | Latin America
Disaggregation of Revenue [Line Items]
Operating revenue	964	926	2,229	2,058
Passenger | Pacific
Disaggregation of Revenue [Line Items]
Operating revenue	$ 654	$ 532	$ 1,232	$ 973

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