Revenue Recognition (Tables)

3 Months Ended

Mar. 31, 2019

Revenue from Contract with Customer [Abstract]

Schedule of disaggregation of revenue

Passenger Revenue

Passenger revenue is primarily composed of passenger ticket sales, loyalty travel awards and travel-related services performed in conjunction with a passenger’s flight.

	Three Months Ended March 31,
(in millions)	2019		2018
Ticket	$	7,988	$	7,653
Loyalty travel awards	692		618
Travel-related services	574		494
Total passenger revenue	$	9,254	$	8,765

Other Revenue

	Three Months Ended March 31,
(in millions)	2019		2018
Loyalty program	$	474	$	347
Ancillary businesses and refinery	369		521
Miscellaneous	183		133
Total other revenue	$	1,026	$	1,001

Schedule of activity in loyalty liability

The table below presents the activity of the current and noncurrent loyalty liability and includes miles earned through travel and miles sold to participating companies, which are primarily through marketing agreements.

(in millions)	2019			2018
Balance at January 1	$	6,641		$	6,321
Mileage credits earned	720			731
Travel mileage credits redeemed	(692		)	(618		)
Non-travel mileage credits redeemed	(45		)	(40		)
Balance at March 31	$	6,624		$	6,394

Schedule of revenue by geographic region

Our passenger and operating revenue by geographic region (as defined by the U.S. Department of Transportation) is summarized in the following table:

	Passenger Revenue				Operating Revenue
	Three Months Ended March 31,				Three Months Ended March 31,
(in millions)	2019		2018		2019		2018
Domestic	$	6,713	$	6,282	$	7,487	$	7,111
Atlantic	1,103		1,070		1,316		1,253
Latin America	855		830		964		917
Pacific	583		583		705		687
Total	$	9,254	$	8,765	$	10,472	$	9,968