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REVENUE RECOGNITION - Narrative (Details) - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Revenue recognized that was previously recorded in air traffic liability	$ 6.5	$ 7.4	$ 4.2
Marketing contracts initial terms, minimum (in years)	1 year
Marketing contracts initial terms, maximum (in years)	13 years
Cash sales of miles from marketing agreements	$ 7.4	$ 6.9	$ 5.7
Majority of new miles, redemption period (in years)	2 years