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Debt - Schedule of Debt Obligations (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2025
Nov. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Debt Instrument [Line Items]          
Long-term debt, gross $ 620   $ 507    
Less: current maturities of long-term debt, net (301)   (261)    
Less: total debt acquisition costs and other discounts, net (6)   (5)    
Long-term debt, net $ 313   $ 241    
Periodic payment, interest, period (in days) 90 days        
CARES Act Credit Agreement, Warrants          
Debt Instrument [Line Items]          
Warrants to acquire common stock (in shares) 237,274   3,117,940    
Exercise price of warrants (in dollars per share)     $ 6.95    
Warrants exercised (in shares) 1,244,608        
Number of securities called by warrants (in shares) 248,893        
Warrant settled, cash potion (less than) $ 1        
Warrants expired (in shares) 1,636,058        
Secured Debt | Revolving Credit Facility          
Debt Instrument [Line Items]          
Long-term debt, gross $ 0   $ 0    
Amount of unsecured borrowings available 220        
Secured Debt | Pre-delivery Credit Facilities          
Debt Instrument [Line Items]          
Long-term debt, gross 348   329    
Amount of unsecured borrowings available 391        
Secured Debt | Building notes          
Debt Instrument [Line Items]          
Long-term debt, gross 0   12    
Unsecured low interest loan amount       $ 12  
Secured Debt | Building Note Tranche One          
Debt Instrument [Line Items]          
Unsecured low interest loan amount         $ 6
Secured Debt | Building Note Tranche Two          
Debt Instrument [Line Items]          
Unsecured low interest loan amount       $ 6  
Secured Debt | 2025-1 EETCs          
Debt Instrument [Line Items]          
Long-term debt, gross 105   0    
Secured Debt | Pass Through Certificates 2025-1 Class A          
Debt Instrument [Line Items]          
Unsecured low interest loan amount   $ 105      
Interest rate (as a percent)   6.75%      
Unsecured Debt | Affinity card advance purchase of miles          
Debt Instrument [Line Items]          
Long-term debt, gross 101   100    
Amount of unsecured borrowings available $ 200        
Term of principal repayments 12 months        
Unsecured Debt | PSP Promissory Notes          
Debt Instrument [Line Items]          
Long-term debt, gross $ 66   $ 66    
Interest rate (as a percent) 1.00%        
Interest rate period (in years) 5 years        
Variable rate (as a percent) 2.00%        
Unsecured Debt | PSP1 Promissory Note          
Debt Instrument [Line Items]          
Loan term (in years) 10 years