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Revenue (Tables)
 9 Months Ended
Sep. 30, 2020
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, 2020 and 2019:
 Three months ended September 30,Nine months ended September 30,
(in millions)2020201920202019
Passenger non-loyalty$1,183 $4,400 $4,966 $13,126 
Passenger loyalty - air transportation205 657 747 1,814 
Passenger ancillary sold separately66 173 290 522 
Total passenger revenues$1,454 $5,230 $6,003 $15,462 
Components of Air Traffic Liability As of September 30, 2020, and December 31, 2019, 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)September 30, 2020December 31, 2019
Air traffic liability - passenger travel and ancillary passenger services$2,907 $2,125 
Air traffic liability - loyalty program4,187 3,385 
Total Air traffic liability$7,094 $5,510 

Rollforwards of the Company's Air traffic liability - loyalty program for the three and nine months ended September 30, 2020 and 2019 were as follows (in millions):

Three months ended September 30,Nine months ended September 30,
2020201920202019
Air traffic liability - loyalty program - beginning balance$3,856 $3,289 $3,385 $3,011 
Amounts deferred associated with points awarded447 727 1,488 2,195 
Revenue recognized from points redeemed - Passenger(205)(657)(747)(1,814)
Revenue recognized from points redeemed - Other(16)(20)(44)(53)
Unused funds converted to loyalty points105 — 105 — 
Air traffic liability - loyalty program - ending balance$4,187 $3,339 $4,187 $3,339 
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, 2020 and 2019 were as follows (in millions):


 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 

 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