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LONG-TERM DEBT - Narrative (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Nov. 15, 2023
USD ($)
Sep. 20, 2023
USD ($)
shares
Oct. 14, 2022
USD ($)
aircraft
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
aircraft
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Nov. 09, 2023
USD ($)
Sep. 30, 2023
USD ($)
Debt Instrument [Line Items]                    
Amortization (accretion) of deferred financing costs and debt discount           $ (1,328,000) $ 1,124,000      
Long-term debt       $ 597,352,000   597,352,000        
Term Loan                    
Debt Instrument [Line Items]                    
Long-term debt, fair value       297,800,000   297,800,000   $ 297,800,000 $ 44,900,000  
Debt instrument, fair value disclosure               9,400,000    
Initial Issuance                    
Debt Instrument [Line Items]                    
Allocation on relative fair value basis                 $ 64,200,000  
Issuance costs                   $ 25,400,000
Deferred Issuance                    
Debt Instrument [Line Items]                    
Common stock issued (in shares) | shares   529,926,270                
Allocation on relative fair value basis               240,900,000    
Private Placement, Reallocated Shares                    
Debt Instrument [Line Items]                    
Deferred issuance costs               30,600,000    
Term Loan                    
Debt Instrument [Line Items]                    
Issuance costs                   4,100,000
Common Class A | Initial Issuance                    
Debt Instrument [Line Items]                    
Common stock issued (in shares) | shares   141,313,671                
Equipment Notes | Notes Payable                    
Debt Instrument [Line Items]                    
Face amount     $ 270,000,000              
Stated rate     12.00%              
Net proceeds     $ 259,200,000              
Annual amortization of principal percent     10.00%              
Debt instrument, restrictive covenants, quarterly minimum liquidity   $ 125,000,000                
Minimum liquidity   $ 75,000,000                
Debt instrument, restrictive covenants, minimum liquidity, deposit           20,000,000   $ 20,000,000    
Debt instrument, maturity trigger period   90 days                
Debt redeemed       26,900,000   26,900,000        
Amortization (accretion) of deferred financing costs and debt discount       2,200,000 $ 900,000 $ 2,700,000 $ 1,800,000      
Equipment Notes | Notes Payable | Not subject to first-priority liens                    
Debt Instrument [Line Items]                    
Number of aircraft | aircraft           14        
Equipment Notes | Notes Payable | Asset Pledged as Collateral                    
Debt Instrument [Line Items]                    
Number of aircraft | aircraft           108        
Flight equipment       259,400,000   $ 259,400,000        
Equipment Notes | Notes Payable | Aircraft                    
Debt Instrument [Line Items]                    
Number of aircraft | aircraft     134              
Credit Agreement                    
Debt Instrument [Line Items]                    
Issuance costs                   29,500,000
Credit Agreement | Term Loan and Revolving Credit Facility | Term Loan                    
Debt Instrument [Line Items]                    
Face amount $ 390,000,000 $ 350,000,000                
Stated rate   10.00%                
Amortization (accretion) of deferred financing costs and debt discount       $ (1,700,000)   $ (4,100,000)        
Proceeds from long-term debt, net 39,200,000 $ 343,000,000                
Increment principal amount 40,000,000                  
Credit agreement interest rate   2.00%                
Long-term debt 8,700,000                 41,400,000
Unamortized debt issuance costs 700,000                 3,400,000
Unamortized debt discount 30,600,000                 $ 305,200,000
Credit Agreement | Term Loan and Revolving Credit Facility | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Aggregate original principal amount $ 100,000,000 $ 100,000,000