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PROPERTY AND EQUIPMENT
 9 Months Ended
Sep. 30, 2022
Property, Plant and Equipment [Abstract]  
PROPERTY AND EQUIPMENT PROPERTY AND EQUIPMENT
Property and equipment consist of the following (in thousands):
September 30, 2022December 31, 2021
Aircraft $559,505 $482,848 
Software development costs55,269 35,818 
Leasehold improvements 10,012 12,584 
Computer equipment 2,476 2,147 
Buildings and improvements1,424 1,424 
Furniture and fixtures3,039 1,960 
Tooling 3,613 3,129 
Vehicles1,461 1,142 
636,799 541,052 
Less: Accumulated depreciation and amortization (248,997)(223,216)
Total $387,802 $317,836 
Depreciation and amortization expense of property and equipment was $10.6 million and $30.3 million for the three and nine months ended September 30, 2022, respectively, and $8.4 million and $26.0 million for the three and nine months ended September 30, 2021, respectively.
Capitalized costs related to the internal development of software was $5.6 million and $18.5 million for the three and nine months ended September 30, 2022, respectively, and $3.9 million and $9.6 million for the three and nine months ended September 30, 2021, respectively.
Amortization expense related to software development costs, included as part of depreciation and amortization expense of property and equipment, was $3.6 million and $9.0 million for the three and nine months ended September 30, 2022, respectively, and $1.8 million and $4.8 million for the three and nine months ended September 30, 2021, respectively.