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Summary of Significant Accounting Policies - Assets Held for Sale (Details)
$ in Thousands
2 Months Ended 3 Months Ended 10 Months Ended 12 Months Ended
Oct. 29, 2024
aircraft
Mar. 12, 2025
USD ($)
Sep. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
aircraft
Dec. 31, 2025
USD ($)
aircraft
Dec. 31, 2024
USD ($)
aircraft
Dec. 31, 2023
USD ($)
Mar. 13, 2025
USD ($)
Property, Plant and Equipment [Line Items]                
Gain (loss) on disposal of assets   $ (11,655)     $ 109,096 $ (273,871) $ (33,966)  
Assets held for sale       $ 463,020 2,973 $ 463,020   $ 447,271
Aircraft Assets                
Property, Plant and Equipment [Line Items]                
Transferred from held for sale     $ 429,500          
Gain (loss) on disposal of assets     $ 3,200   $ 3,200      
A320 and A321                
Property, Plant and Equipment [Line Items]                
Number of aircraft to be sold | aircraft 23     23        
Number of aircraft transferred from held-for-sale | aircraft       21 20 21