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Property and Equipment, Net - Schedule of Components of Property and Equipment, Net (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Property, Plant and Equipment [Line Items]    
Less: accumulated depreciation $ (333) $ (252)
Total property and equipment, net 510 376
Flight equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 652 461
Ground and other equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 191 $ 167