v3.26.3
Debt - Schedule of Debt Obligations (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2026
Dec. 31, 2025
Nov. 30, 2025
Sep. 30, 2025
Dec. 31, 2024
Debt Instrument [Line Items]            
Long-term debt, gross $ 486.0 $ 486.0 $ 620.0      
Less: current maturities of long-term debt, net (160.0) (160.0) (301.0)      
Less: total debt acquisition costs and other discounts, net (4.0) (4.0) (6.0)      
Long-term debt, net $ 322.0 $ 322.0 313.0      
CARES Act Credit Agreement, Warrants            
Debt Instrument [Line Items]            
Warrants to acquire common stock (in shares)           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) (Less than for 248,893 248,893        
Cash settlement (less than) 1 million          
Warrants expired (in shares) 237,274 237,274        
Secured Debt | Pre-delivery Credit Facilities            
Debt Instrument [Line Items]            
Long-term debt, gross $ 180.0 $ 180.0 348.0      
Amount of unsecured borrowings available 285.0 285.0        
Secured Debt | 2025-1 EETCs            
Debt Instrument [Line Items]            
Long-term debt, gross 100.0 100.0 105.0 $ 105.0    
Interest rate (in percent)       6.75%    
Secured Debt | Revolving Loan Facility            
Debt Instrument [Line Items]            
Long-term debt, gross 0.0 0.0 0.0      
Amount of unsecured borrowings available     220.0      
Unsecured Debt | Affinity card advance purchase of miles            
Debt Instrument [Line Items]            
Long-term debt, gross 140.0 140.0 101.0      
Amount of unsecured borrowings available 375.0 375.0        
Unsecured Debt | PSP Promissory Notes            
Debt Instrument [Line Items]            
Long-term debt, gross $ 66.0 $ 66.0 $ 66.0      
Interest rate (in percent) 1.00% 1.00%        
Interest rate period (in years)   5 years        
Debt instrument, variable interest rate (in percent)   2.00%        
Unsecured Debt | PSP1 Promissory Note            
Debt Instrument [Line Items]            
Loan term (in years)   10 years