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Revenue (Tables)
 9 Months Ended
Sep. 30, 2024
Revenue from Contract with Customer [Abstract]  
Schedule of Disaggregation of Passenger Revenue The following table provides the components of Passenger revenue recognized for the three and nine months ended September 30, 2024 and 2023:
 Three months ended September 30,Nine months ended September 30,
(in millions)2024202320242023
Passenger non-loyalty$5,092 $4,758 $15,316 $14,023 
Passenger loyalty - air transportation896 916 2,589 2,730 
Passenger ancillary sold separately262 238 768 673 
Total passenger revenues$6,250 $5,912 $18,673 $17,426 
Schedule of Rollforward of Air Traffic Liability
As of September 30, 2024, and December 31, 2023, the components of Air traffic liability, including contract liabilities based on tickets sold and unused flight credits available to the Customer, both of which are net of recorded breakage, and loyalty points available for redemption, within the unaudited Condensed Consolidated Balance Sheet were as follows:
 Balance as of
(in millions)September 30, 2024December 31, 2023
Air traffic liability - passenger travel and ancillary passenger services$3,814 $3,363 
Air traffic liability - loyalty program4,886 4,916 
Total Air traffic liability$8,700 $8,279 
Rollforwards of the Company's Air traffic liability - loyalty program for the three and nine months ended September 30, 2024 and 2023 were as follows:
Three months ended September 30,Nine months ended September 30,
(in millions)2024202320242023
Air traffic liability - loyalty program - beginning balance$4,962 $5,079 4,916 $5,189 
Amounts deferred associated with points awarded851 859 2,645 2,609 
Revenue recognized from points redeemed - Passenger(896)(916)(2,589)(2,730)
Revenue recognized from points redeemed - Other(31)(26)(86)(72)
Air traffic liability - loyalty program - ending balance$4,886 $4,996 $4,886 $4,996 
Rollforwards of the amounts included in Air traffic liability as of September 30, 2024 and 2023 were as follows:
Nine months ended September 30,
(in millions)20242023
Air traffic liability - beginning balance$8,279 $8,250 
Current period sales (a)19,181 18,249 
Revenue from amounts included in contract liability opening balances(4,593)(5,263)
Revenue from current period sales(14,167)(12,236)
Air traffic liability - ending balance$8,700 $9,000 
(a)Current period sales include passenger travel, ancillary services, flight loyalty, and partner loyalty