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REVENUE (Tables)
 12 Months Ended
Dec. 31, 2024
Revenue from Contract with Customer [Abstract]  
Disaggregation of Passenger Revenue The following table provides the components of Passenger revenue recognized for the years ended December 31, 2024, 2023, and 2022:
 Year ended December 31,
(in millions)202420232022
Passenger non-loyalty$20,467 $19,073 $17,645 
Passenger loyalty - air transportation3,484 3,639 3,028 
Passenger ancillary sold separately1,029 925 735 
Total passenger revenues$24,980 $23,637 $21,408 
Rollforward of Air Traffic Liability
As of the years ended December 31, 2024 and 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 Consolidated Balance Sheet were as follows:

 Balance as of
(in millions)December 31, 2024December 31, 2023
Air traffic liability - passenger travel and ancillary passenger services$3,393 $3,363 
Air traffic liability - loyalty program4,849 4,916 
Total Air traffic liability$8,242 $8,279 
Rollforwards of the Company's Air traffic liability - loyalty program for the years ended December 31, 2024 and 2023 were as follows (in millions):
Year ended December 31,
20242023
Air traffic liability - loyalty program - beginning balance$4,916 $5,189 
Amounts deferred associated with points awarded3,532 3,466 
Revenue recognized from points redeemed - Passenger(3,484)(3,639)
Revenue recognized from points redeemed - Other(115)(100)
Air traffic liability - loyalty program - ending balance$4,849 $4,916 

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 December 31, 2024 and 2023 were as follows (in millions):

Year ended December 31,
(in millions)20242023
Air traffic liability - beginning balance$8,279 $8,250 
Current period sales (a)25,057 23,766 
Revenue from amounts included in contract liability opening balances(5,082)(5,031)
Revenue from current period sales(20,012)(18,706)
Air traffic liability - ending balance$8,242 $8,279 
(a)Current period sales include passenger travel, ancillary services, flight loyalty, and partner loyalty