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Special Items (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Special items    
Spirit acquisition costs $ 532 $ 17
Voluntary opt-out costs 15 0
Embraer E190 fleet transition costs 15 0
Union contract costs 0 95
Total special items $ 562 $ 112