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REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)
 6 Months Ended
Jun. 30, 2024
Revenue Recognition [Abstract]  
Disaggregation of Revenue
Passenger revenue recognized in the unaudited Condensed Consolidated Statements of Operations (in millions):
Three Months Ended June 30,Six Months Ended June 30,
2024202320242023
Passenger ticket revenue, net of taxes and fees$2,226 $2,207 $3,874 $3,855 
Passenger ancillary revenue135 123 243 227 
Mileage Plan passenger revenue290 268 538 500 
Total Passenger revenue$2,651 $2,598 $4,655 $4,582 
Mileage Plan revenue included in the unaudited Condensed Consolidated Statements of Operations (in millions):
Three Months Ended June 30,Six Months Ended June 30,
2024202320242023
Mileage Plan passenger revenue$290 $268 $538 $500 
Mileage Plan other revenue174 170 338 324 
Total Mileage Plan revenue$464 $438 $876 $824 
Cargo and other revenue included in the unaudited Condensed Consolidated Statements of Operations (in millions):
Three Months Ended June 30,Six Months Ended June 30,
2024202320242023
Cargo revenue$36 $39 $64 $68 
Other revenue36 31 72 60 
Total Cargo and other revenue$72 $70 $136 $128 
Contract with Customer Liabilities
The table below presents a roll forward of the total frequent flyer liability (in millions):
Six Months Ended June 30,
20242023
Total Deferred Revenue balance at January 1$2,603 $2,497 
Travel miles and companion certificate redemption - Passenger revenue(508)(470)
Miles redeemed on partner airlines - Other revenue(67)(52)
Increase in liability for mileage credits issued613 602 
Total Deferred Revenue balance at June 30$2,641 $2,577