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Debt - Schedule of Debt Obligations (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Debt Instrument [Line Items]        
Long-term debt, gross $ 455 $ 455   $ 474
Less: current maturities of long-term debt, net (263) (263)   (251)
Less: total debt acquisition costs and other discounts, net (3) (3)   (4)
Long-term debt, net $ 189 189   219
Principal repayments on debt   $ 161 $ 51  
Term, after interest-only period 12 months 12 months    
CARES Act Credit Agreement, Warrants        
Debt Instrument [Line Items]        
Warrants to acquire common stock (in shares) 3,117,940 3,117,940    
Exercise price of warrants (in dollars per share) $ 6.95 $ 6.95    
Secured Debt | Pre-delivery credit facility        
Debt Instrument [Line Items]        
Long-term debt, gross $ 300 $ 300   312
Amount of unsecured borrowings available $ 365 $ 365    
Term extension, maximum 6 months 6 months    
Secured Debt | Building note        
Debt Instrument [Line Items]        
Long-term debt, gross $ 6 $ 6   16
Principal repayments on debt 16      
Secured Debt | Fixed Income Interest Rate        
Debt Instrument [Line Items]        
Unsecured low interest loan amount $ 6 $ 6    
Interest rate 6.79% 6.79%    
Unsecured Debt | Affinity card advance purchase of miles        
Debt Instrument [Line Items]        
Long-term debt, gross $ 66 $ 66   66
Amount of unsecured borrowings available 200 200    
Unsecured Debt | PSP promissory notes        
Debt Instrument [Line Items]        
Long-term debt, gross $ 83 $ 83   $ 80
Interest rate 1.00% 1.00%    
Interest rate period   5 years    
Debt instrument, variable interest rate   2.00%    
Unsecured Debt | PSP1 Promissory Note        
Debt Instrument [Line Items]        
Loan term   10 years