Revenue Recognition (Tables)

12 Months Ended

Dec. 31, 2019

Revenue from Contract with Customer [Abstract]

Schedule of disaggregation of 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.

	Year Ended December 31,
(in millions)	2019		2018		2017
Ticket	$	36,908	$	34,950	$	32,467
Loyalty travel awards	2,900		2,651		2,403
Travel-related services	2,469		2,154		2,077
Total passenger revenue	$	42,277	$	39,755	$	36,947

Other Revenue

	Year Ended December 31,
(in millions)	2019		2018		2017
Loyalty program	$	1,962	$	1,459	$	1,269
Ancillary businesses and refinery	1,297		1,801		1,591
Miscellaneous	718		558		587
Total other revenue	$	3,977	$	3,818	$	3,447

Schedule of activity in loyalty liability

The table below presents the activity of the current and noncurrent loyalty program 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
Miles earned	3,156		3,142
Travel miles redeemed	(2,900)		(2,651)
Non-travel miles redeemed	(169)		(171)
Balance at December 31	$	6,728	$	6,641

Schedule of revenue by geographic region

Operating revenue for the airline segment is recognized in a specific geographic region based on the origin, flight path and destination of each flight segment. The majority of the revenues of the refinery, consisting of fuel sales to the airline, have been eliminated in the Consolidated Financial Statements. The remaining operating revenue for the refinery segment is included in the domestic region. Our passenger and operating revenue by geographic region is summarized in the following table:

	Passenger Revenue						Operating Revenue
	Year Ended December 31,						Year Ended December 31,
(in millions)	2019		2018		2017		2019		2018		2017
Domestic	$	30,367	$	28,159	$	26,079	$	33,284	$	31,233	$	28,850
Atlantic	6,381		6,165		5,537		7,363		7,042		6,297
Latin America	3,002		2,888		2,862		3,343		3,181		3,133
Pacific	2,527		2,543		2,469		3,017		2,982		2,858
Total	$	42,277	$	39,755	$	36,947	$	47,007	$	44,438	$	41,138