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LONG-TERM DEBT (Tables)
 3 Months Ended
Mar. 31, 2023
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments Long-term debt obligations on the consolidated balance sheet (in millions):
 March 31, 2023December 31, 2022
Fixed-rate notes payable due through 2029$100 $113 
Fixed-rate PSP notes payable due through 2031600 600 
Fixed-rate EETC payable due through 2025 & 2027891 947 
Variable-rate notes payable due through 2029487 514 
Less debt issuance costs(15)(15)
Total debt2,063 2,159 
Less current portion268 276 
Long-term debt, less current portion$1,795 $1,883 
Weighted-average fixed-interest rate3.5 %3.5 %
Weighted-average variable-interest rate6.1 %5.8 %
Schedule of Maturities of Long-term Debt At March 31, 2023, long-term debt principal payments for the next five years and thereafter are as follows (in millions):
 Total
Remainder of 2023$185 
2024243 
2025296 
2026176 
2027535 
Thereafter643 
Total Principal Payments$2,078