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Revenue (Tables)

3 Months Ended

Mar. 31, 2018

Revenue from Contract with Customer [Abstract]

Disaggregation of Passenger Revenue

The following table provides the components of Passenger revenue for the three months ended March 31, 2018 and 2017 (in millions):

	Three months ended March 31,
(in millions)	2018				2017
Passenger non-loyalty	$	3,948			$	3,907
Passenger loyalty - air transportation	491				507
Passenger ancillary sold separately	146				132
Total passenger revenues	$	4,585			$	4,546

Components of Air Traffic Liability

The components of Air traffic liability, including contract liabilities based on tickets sold, unused funds available to the Customer, and frequent flyer points available for redemption, net of expected spoilage, as of March 31, 2018 and December 31, 2017 were as follows (in millions):

	Balance as of
(in millions)	March 31, 2018				December 31, 2017
Air traffic liability - passenger travel and ancillary passenger services	$	2,631			$	1,898
Air traffic liability - loyalty program	2,799				2,667
Total Air traffic liability	$	5,430			$	4,565

Rollforward of Air Traffic Liability

Air traffic liability includes consideration received for ticket and loyalty related performance obligations which have not been satisfied as of a given date. A rollforward of the amounts included in Air traffic liability as of March 31, 2018 and 2017 are as follows (in millions):

	Air traffic liability
Balance at December 31, 2017	$	4,565
Current period sales (passenger travel, ancillary services, flight loyalty, and partner loyalty)	5,403
Revenue from amounts included in contract liability opening balances (a)	(1,827		)
Revenue from current period sales (a)	(2,711		)
Balance at March 31, 2018	$	5,430

(a) Does not include certain ancillary revenues that are purchased on the day of travel, which do not flow through Air traffic liability.

	Air traffic liability
Balance at December 31, 2016	$	4,221
Current period sales (passenger travel, ancillary services, flight loyalty, and partner loyalty)	5,415
Revenue from amounts included in contract liability opening balances (a)	(1,701		)
Revenue from current period sales (a)	(2,796		)
Balance at March 31, 2017	$	5,139

X

- Definition

Tabular disclosure of contract balances and changes in contract balances.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130551-203045

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 13.A.4(a).Q1)
-URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6935-107765

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045

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