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LONG-TERM DEBT (Tables)
 6 Months Ended
Jun. 30, 2023
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
Long-term debt obligations on the condensed consolidated balance sheets (in millions):
 June 30, 2023December 31, 2022
Fixed-rate notes payable due through 2029$95 $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 2035573 514 
Less debt issuance costs(13)(15)
Total debt2,146 2,159 
Less current portion(a)
257 276 
Long-term debt, less current portion$1,889 $1,883 
Weighted-average fixed-interest rate3.5 %3.5 %
Weighted-average variable-interest rate6.5 %5.8 %
(a) Excludes finance lease liabilities recognized within "Current portion of long-term debt and finance leases" in the condensed consolidated balance sheets as of June 30, 2023.
Schedule of Maturities of Long-term Debt At June 30, 2023, long-term debt principal payments for the next five years and thereafter are as follows (in millions):
 Total
Remainder of 2023$135 
2024251 
2025304 
2026184 
2027544 
Thereafter741 
Total Principal Payments$2,159