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Commitments and Contingencies - Narrative (Details)
$ in Billions
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 25, 2024
aircraft
Oct. 24, 2024
USD ($)
aircraft
Sep. 30, 2024
USD ($)
aircraft
Jul. 31, 2024
aircraft
Sep. 30, 2024
USD ($)
aircraft
Sep. 30, 2024
USD ($)
aircraft
Aircraft            
Long-term Purchase Commitment [Line Items]            
Capital commitments remainder of 2024 | $     $ 1.6   $ 1.6 $ 1.6
Capital commitments in 2025 | $     1.8   1.8 1.8
Capital commitments in 2026 | $     1.8   1.8 1.8
Capital commitments in 2027 | $     2.6   2.6 2.6
Capital commitments in 2028 | $     2.9   2.9 2.9
Capital commitments in 2029 | $     2.5   2.5 2.5
Capital commitments thereafter | $     $ 2.7   $ 2.7 $ 2.7
Aircraft | Subsequent Event            
Long-term Purchase Commitment [Line Items]            
Capital commitments in 2025 | $   $ 2.0        
Capital commitments in 2026 | $   $ 1.9        
B737-8            
Long-term Purchase Commitment [Line Items]            
Number of aircraft deliveries | aircraft         9 19
Number of aircraft orders converted | aircraft       2    
B737-8 | Subsequent Event            
Long-term Purchase Commitment [Line Items]            
Number of aircraft deliveries | aircraft 1          
Number of aircraft orders converted | aircraft   9        
B-737-700            
Long-term Purchase Commitment [Line Items]            
Number of aircraft retirements | aircraft         14  
B-737-800            
Long-term Purchase Commitment [Line Items]            
Number of aircraft retirements | aircraft         1  
B737-7            
Long-term Purchase Commitment [Line Items]            
Number of aircraft options exercised | aircraft     4 2    
B737-7 | Subsequent Event | Year 2025            
Long-term Purchase Commitment [Line Items]            
Number of aircraft options exercised | aircraft   5        
B737-7 | Subsequent Event | Year 2026            
Long-term Purchase Commitment [Line Items]            
Number of aircraft options exercised | aircraft   1