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LONG-TERM DEBT - LINE OF CREDIT (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Line of Credit Facility [Line Items]      
Proceeds from Issuance of Secured Debt   $ 344 $ 313
Adjustments to Additional Paid in Capital, Warrant Issued $ 13    
Line of Credit Facility, Asset Restrictions   500  
Credit Facility 3 [Member] | Secured by aircraft [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity   76  
US Treasury CARES Act Loan [Member]      
Line of Credit Facility [Line Items]      
Adjustments to Additional Paid in Capital, Warrant Issued   30  
Revolving Credit Facility | Secured by certain accounts receivable, spare engines, spare parts and ground service equipment [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity   $ 850