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REVENUE RECOGNITION - Revenue by Geographic Region (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Operating revenue	$ 16,673	$ 15,677	$ 47,361	$ 46,084
Domestic
Disaggregation of Revenue [Line Items]
Operating revenue	11,561	10,609	33,032	32,216
Atlantic
Disaggregation of Revenue [Line Items]
Operating revenue	3,423	3,418	8,353	8,209
Latin America
Disaggregation of Revenue [Line Items]
Operating revenue	882	889	3,497	3,432
Pacific
Disaggregation of Revenue [Line Items]
Operating revenue	807	761	2,479	2,227
Passenger
Disaggregation of Revenue [Line Items]
Operating revenue	13,506	13,107	38,852	38,079
Passenger | Domestic
Disaggregation of Revenue [Line Items]
Operating revenue	9,103	8,652	26,521	26,033
Passenger | Atlantic
Disaggregation of Revenue [Line Items]
Operating revenue	2,977	3,029	7,221	7,159
Passenger | Latin America
Disaggregation of Revenue [Line Items]
Operating revenue	759	779	3,047	3,008
Passenger | Pacific
Disaggregation of Revenue [Line Items]
Operating revenue	$ 667	$ 647	$ 2,063	$ 1,879

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