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REVENUE RECOGNITION - Revenue by Geographic Region (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Operating revenue	$ 14,040	$ 13,748
Domestic
Disaggregation of Revenue [Line Items]
Operating revenue	10,055	10,031
Atlantic
Disaggregation of Revenue [Line Items]
Operating revenue	1,646	1,581
Latin America
Disaggregation of Revenue [Line Items]
Operating revenue	1,523	1,442
Pacific
Disaggregation of Revenue [Line Items]
Operating revenue	816	694
Passenger
Disaggregation of Revenue [Line Items]
Operating revenue	11,480	11,131
Passenger | Domestic
Disaggregation of Revenue [Line Items]
Operating revenue	8,101	7,983
Passenger | Atlantic
Disaggregation of Revenue [Line Items]
Operating revenue	1,372	1,305
Passenger | Latin America
Disaggregation of Revenue [Line Items]
Operating revenue	1,334	1,265
Passenger | Pacific
Disaggregation of Revenue [Line Items]
Operating revenue	$ 673	$ 578

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