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REVENUE RECOGNITION - Revenue by Geographic Region (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]
Operating revenue	$ 16,648	$ 16,658	$ 30,688	$ 30,406
Domestic
Disaggregation of Revenue [Line Items]
Operating revenue	11,417	11,575	21,472	21,607
Atlantic
Disaggregation of Revenue [Line Items]
Operating revenue	3,283	3,210	4,929	4,791
Latin America
Disaggregation of Revenue [Line Items]
Operating revenue	1,093	1,102	2,615	2,543
Pacific
Disaggregation of Revenue [Line Items]
Operating revenue	855	771	1,672	1,465
Passenger
Disaggregation of Revenue [Line Items]
Operating revenue	13,867	13,841	25,347	24,972
Passenger | Domestic
Disaggregation of Revenue [Line Items]
Operating revenue	9,318	9,398	17,418	17,381
Passenger | Atlantic
Disaggregation of Revenue [Line Items]
Operating revenue	2,872	2,825	4,245	4,130
Passenger | Latin America
Disaggregation of Revenue [Line Items]
Operating revenue	954	964	2,288	2,229
Passenger | Pacific
Disaggregation of Revenue [Line Items]
Operating revenue	$ 723	$ 654	$ 1,396	$ 1,232

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