REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)

12 Months Ended

Dec. 31, 2019

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,
	2019		2018		2017
Passenger ticket revenue, including ticket breakage and net of taxes and fees	$	6,824	$	6,482	$	6,246
Passenger ancillary revenue	567		530		514
Mileage Plan passenger revenue	704		619		541
Total passenger revenue	$	8,095	$	7,631	$	7,301

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

	Twelve Months Ended December 31,
	2019		2018		2017
Passenger revenue	$	704	$	619	$	541
Mileage Plan other revenue	465		434		418
Total Mileage Plan revenue	$	1,169	$	1,053	$	959

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

	Twelve Months Ended December 31,
	2019		2018		2017
Cargo revenue	$	133	$	129	$	115
Other revenue	88		70		60
Total Cargo and other revenue	$	221	$	199	$	175

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,
	2019		2018
Total Deferred Revenue balance at January 1	$	1,874	$	1,725
Travel miles and companion certificate redemption - Passenger revenue	(704)		(619)
Miles redeemed on partner airlines - Other revenue	(111)		(90)
Increase in liability for mileage credits issued	931		858
Total Deferred Revenue balance at December 31	$	1,990	$	1,874