REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)

12 Months Ended

Dec. 31, 2023

Revenue from Contracts with Customer [Abstract]

Disaggregation of Revenue [Table Text Block]

Passenger revenue recognized in the consolidated statements of operations (in millions):

	Twelve Months Ended December 31,
	2023		2022		2021
Passenger ticket revenue, net of taxes and fees	$	8,016	$	7,430	$	4,533
Passenger ancillary revenue	476		447		327
Mileage Plan passenger revenue	1,034		931		639
Total Passenger revenue	$	9,526	$	8,808	$	5,499

Mileage Plan revenue included in the consolidated statements of operations (in millions):

	Twelve Months Ended December 31,
	2023		2022		2021
Passenger revenue	$	1,034	$	931	$	639
Mileage Plan other revenue	648		590		461
Total Mileage Plan revenue	$	1,682	$	1,521	$	1,100

Cargo and other revenue included in the consolidated statements of operations (in millions):

	Twelve Months Ended December 31,
	2023		2022		2021
Cargo revenue	$	128	$	133	$	124
Other revenue	124		115		92
Total Cargo and other revenue	$	252	$	248	$	216

Contract with Customer, Asset and Liability [Table Text Block]

The table below presents a roll forward of the total frequent flyer liability (in millions):

	Twelve Months Ended December 31,
	2023		2022
Total Deferred Revenue balance at January 1	$	2,497	$	2,358
Travel miles and companion certificate redemption - Passenger revenue	(974)		(878)
Miles redeemed on partner airlines - Other revenue	(117)		(65)
Increase in liability for mileage credits issued	1,197		1,082
Total Deferred Revenue balance at December 31	$	2,603	$	2,497