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COMMITMENTS AND CONTINGENCIES COMMITMENTS AND CONTINGENCIES (Tables)
 12 Months Ended
Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases and Unrecorded Unconditional Purchase Obligtaions [Table Text Block]
Future minimum payments for commitments as of December 31, 2023 (in millions):
 
Aircraft-Related Commitments(a)
Capacity Purchase Agreements and Other Obligations(b)
2024$1,252 $235 
20251,366 230 
20261,097 224 
2027600 220 
2028151 223 
Thereafter716 515 
Total$5,182 $1,647