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Revenue (Tables)
 9 Months Ended
Sep. 30, 2019
Revenue from Contract with Customer [Abstract]  
Disaggregation of Passenger Revenue The following table provides the components of Passenger revenue recognized for the three and nine months ended September 30, 2019 and 2018:

 
Three months ended September 30,
 
Nine months ended September 30,
(in millions)
2019
 
2018
 
2019
 
2018
Passenger non-loyalty
$
4,400

 
$
4,417

 
$
13,126

 
$
12,969

Passenger loyalty - air transportation
657

 
623

 
1,814

 
1,702

Passenger ancillary sold separately
173

 
154

 
522

 
466

   Total passenger revenues
$
5,230

 
$
5,194

 
$
15,462

 
$
15,137
Components of Air Traffic Liability
As of September 30, 2019, and December 31, 2018, the components of Air traffic liability, 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)
September 30, 2019
 
December 31, 2018
Air traffic liability - passenger travel and ancillary passenger services
$
2,627

 
$
2,059

Air traffic liability - loyalty program
3,339

 
3,011

   Total Air traffic liability
$
5,966

 
$
5,070























Rollforwards of the Company's Air traffic liability - loyalty program for the three and nine months ended September 30, 2019 and 2018 were as follows (in millions):

 
Three months ended September 30,
 
Nine months ended September 30,
 
2019
 
2018
 
2019
 
2018
Air traffic liability - loyalty program - beginning balance
$
3,289

 
$
2,919

 
$
3,011

 
$
2,667

   Amounts deferred associated with points awarded
727

 
669

 
2,195

 
2,027

   Revenue recognized from points redeemed - Passenger
(657
)
 
(623
)
 
(1,814
)
 
(1,702
)
   Revenue recognized from points redeemed - Other
(20
)
 
(17
)
 
(53
)
 
(44
)
Air traffic liability - loyalty program - ending balance
$
3,339

 
$
2,948

 
$
3,339

 
$
2,948
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. Rollforwards of the amounts included in Air traffic liability as of September 30, 2019 and 2018 were as follows (in millions):

 
Air traffic liability
Balance at December 31, 2018
$
5,070

   Current period sales (passenger travel, ancillary services, flight loyalty, and partner loyalty)
16,410

   Revenue from amounts included in contract liability opening balances
(3,160
)
   Revenue from current period sales
(12,354
)
Balance at September 30, 2019
$
5,966



 
Air traffic liability
Balance at December 31, 2017
$
4,565

   Current period sales (passenger travel, ancillary services, flight loyalty, and partner loyalty)
16,200

   Revenue from amounts included in contract liability opening balances
(3,098
)
   Revenue from current period sales
(12,084
)
Balance at September 30, 2018
$
5,583