Revenue (Tables)

6 Months Ended

Jun. 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 six months ended June 30, 2021 and 2020:

	Three months ended June 30,				Six months ended June 30,
(in millions)	2021		2020		2021		2020
Passenger non-loyalty	$	2,875	$	562	$	4,230	$	3,783
Passenger loyalty - air transportation	549		81		826		542
Passenger ancillary sold separately	145		61		226		224
Total passenger revenues	$	3,569	$	704	$	5,282	$	4,549

Rollforward of Air Traffic Liability

As of June 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 spoilage, within the unaudited Condensed Consolidated Balance Sheet were as follows:

	Balance as of
(in millions)	June 30, 2021		December 31, 2020
Air traffic liability - passenger travel and ancillary passenger services	$	3,960	$	2,686
Air traffic liability - loyalty program	4,719		4,447
Total Air traffic liability	$	8,679	$	7,133

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

	Three months ended June 30,				Six months ended June 30,
	2021		2020		2021		2020
Air traffic liability - loyalty program - beginning balance	$	4,623	$	3,561	$	4,447	$	3,385
Amounts deferred associated with points awarded	656		385		1,121		1,041
Revenue recognized from points redeemed - Passenger	(549)		(81)		(826)		(542)
Revenue recognized from points redeemed - Other	(11)		(9)		(23)		(28)
Air traffic liability - loyalty program - ending balance	$	4,719	$	3,856	$	4,719	$	3,856

Rollforwards of the amounts included in Air traffic liability as of June 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)	6,851
Revenue from amounts included in contract liability opening balances	(1,600)
Revenue from current period sales	(3,705)
Balance at June 30, 2021	$	8,679

	Air traffic liability
Balance at December 31, 2019	$	5,510
Current period sales (passenger travel, ancillary services, flight loyalty, and partner loyalty)	5,946
Revenue from amounts included in contract liability opening balances	(1,936)
Revenue from current period sales	(2,641)
Balance at June 30, 2020	$	6,879