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REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)
 3 Months Ended
Mar. 31, 2024
Revenue Recognition [Abstract]  
Disaggregation of Revenue
Passenger revenue recognized in the condensed consolidated statements of operations (in millions):
Three Months Ended March 31,
20242023
Passenger ticket revenue, net of taxes and fees$1,648 $1,648 
Passenger ancillary revenue108 104 
Mileage Plan passenger revenue248 232 
Total Passenger revenue$2,004 $1,984 
Mileage Plan revenue included in the condensed consolidated statements of operations (in millions):
Three Months Ended March 31,
20242023
Mileage Plan passenger revenue$248 $232 
Mileage Plan other revenue164 154 
Total Mileage Plan revenue$412 $386 
Cargo and other revenue included in the condensed consolidated statements of operations (in millions):
Three Months Ended March 31,
20242023
Cargo revenue$28 $29 
Other revenue36 29 
Total Cargo and other revenue$64 $58 
Contract with Customer Liabilities
The table below presents a roll forward of the total frequent flyer liability (in millions):
Three Months Ended March 31,
20242023
Total Deferred Revenue balance at January 1$2,603 $2,497 
Travel miles and companion certificate redemption - Passenger revenue(234)(218)
Miles redeemed on partner airlines - Other revenue(28)(21)
Increase in liability for mileage credits issued292 285 
Total Deferred Revenue balance at March 31$2,633 $2,543