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Fair Value Measurements - Summary of Carrying Amounts and Estimated Fair Values of the Company’s Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Carrying
Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt $ 620 $ 507
Estimated Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt 626 505
Pre-delivery Credit Facilities | Carrying
Value | Secured Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt 348 329
Pre-delivery Credit Facilities | Estimated Fair Value | Secured Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt 352 333
Building notes | Carrying
Value | Secured Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt 0 12
Building notes | Estimated Fair Value | Secured Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt 0 12
2025-1 EETCs | Carrying
Value | Secured Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt 105 0
2025-1 EETCs | Estimated Fair Value | Secured Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt 109 0
Affinity card advance purchase of miles | Carrying
Value | Unsecured Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt 101 100
Affinity card advance purchase of miles | Estimated Fair Value | Unsecured Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt 100 98
PSP Promissory Notes | Carrying
Value | Unsecured Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt 66 66
PSP Promissory Notes | Estimated Fair Value | Unsecured Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt $ 65 $ 62