Quarterly report pursuant to Section 13 or 15(d)

PROPERTY AND EQUIPMENT - Schedule of Property and Equipment (Details)

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PROPERTY AND EQUIPMENT - Schedule of Property and Equipment (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 608,144 $ 541,052
Less: Accumulated depreciation and amortization (227,919) (223,216)
Total 380,225 317,836
Aircraft    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 548,300 482,848
Software development costs    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 41,416 35,818
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 8,301 12,584
Computer equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 2,147 2,147
Buildings and improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 1,424 1,424
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 1,997 1,960
Tooling    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 3,402 3,129
Vehicles    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 1,157 $ 1,142