REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)

12 Months Ended

Dec. 31, 2020

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,
	2020		2019		2018
Passenger ticket revenue, including ticket breakage and net of taxes and fees	$	2,428	$	6,824	$	6,482
Passenger ancillary revenue	245		567		530
Mileage Plan passenger revenue	346		704		619
Total passenger revenue	$	3,019	$	8,095	$	7,631

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

	Twelve Months Ended December 31,
	2020		2019		2018
Passenger revenue	$	346	$	704	$	619
Mileage Plan other revenue	374		465		434
Total Mileage Plan revenue	$	720	$	1,169	$	1,053

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

	Twelve Months Ended December 31,
	2020		2019		2018
Cargo revenue	$	112	$	133	$	129
Other revenue	61		88		70
Total Cargo and other revenue	$	173	$	221	$	199

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,
	2020		2019
Total Deferred Revenue balance at January 1	$	1,990	$	1,874
Travel miles and companion certificate redemption - Passenger revenue	(346)		(704)
Miles redeemed on partner airlines - Other revenue	(23)		(111)
Increase in liability for mileage credits issued	656		931
Total Deferred Revenue balance at December 31	$	2,277	$	1,990