Revenue (Tables)

9 Months Ended

Sep. 30, 2021

Revenue from Contract with Customer [Abstract]

Disaggregation of Passenger Revenue

The following table provides the components of Passenger revenue recognized within the unaudited Condensed Consolidated Statement of Comprehensive Income (Loss) for the three and nine months ended September 30, 2021 and 2020:

	Three months ended September 30,				Nine months ended September 30,
(in millions)	2021		2020		2021		2020
Passenger non-loyalty	$	3,443	$	1,183	$	7,672	$	4,966
Passenger loyalty - air transportation	621		205		1,448		747
Passenger ancillary sold separately	163		66		388		290
Total passenger revenues	$	4,227	$	1,454	$	9,508	$	6,003

Rollforward of Air Traffic Liability

As of September 30, 2021, and December 31, 2020, the components of Air traffic liability and Air traffic liability - noncurrent, including contract liabilities based on tickets sold, unused funds available to the Customer, and loyalty points available for redemption, net of expected breakage, within the unaudited Condensed Consolidated Balance Sheet were as follows:

	Balance as of
(in millions)	September 30, 2021		December 31, 2020
Air traffic liability - passenger travel and ancillary passenger services	$	3,464	$	2,686
Air traffic liability - loyalty program	4,772		4,447
Total Air traffic liability	$	8,236	$	7,133

Rollforwards of the Company's Air traffic liability - loyalty program for the three and nine months ended September 30, 2021 and 2020 were as follows (in millions):

	Three months ended September 30,				Nine months ended September 30,
	2021		2020		2021		2020
Air traffic liability - loyalty program - beginning balance	$	4,719	$	3,856	$	4,447	$	3,385
Amounts deferred associated with points awarded	688		447		1,810		1,488
Revenue recognized from points redeemed - Passenger	(621)		(205)		(1,448)		(747)
Revenue recognized from points redeemed - Other	(14)		(16)		(37)		(44)
Unused funds converted to loyalty points	—		105		—		105
Air traffic liability - loyalty program - ending balance	$	4,772	$	4,187	$	4,772	$	4,187

Rollforwards of the amounts included in Air traffic liability as of September 30, 2021 and 2020 were as follows (in millions):

	Air traffic liability
Balance at December 31, 2020	$	7,133
Current period sales (passenger travel, ancillary services, flight loyalty, and partner loyalty)	10,648
Revenue from amounts included in contract liability opening balances	(2,346)
Revenue from current period sales	(7,199)
Balance at September 30, 2021	$	8,236

	Air traffic liability
Balance at December 31, 2019	$	5,510
Current period sales (passenger travel, ancillary services, flight loyalty, and partner loyalty)	7,631
Revenue from amounts included in contract liability opening balances	(2,126)
Revenue from current period sales	(3,921)
Balance at September 30, 2020	$	7,094