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PROPERTY AND EQUIPMENT
 6 Months Ended
Jun. 30, 2024
Property, Plant and Equipment [Abstract]  
PROPERTY AND EQUIPMENT PROPERTY AND EQUIPMENT
Property and equipment, net consisted of the following (in thousands):
June 30, 2024December 31, 2023
Aircraft $411,326 $475,058 
Software development costs85,079 81,075 
Leasehold improvements 24,089 22,899 
Computer equipment 3,342 3,515 
Buildings and improvements1,424 1,424 
Furniture and fixtures4,570 4,618 
Tooling 3,660 3,898 
Vehicles2,172 2,166 
Total Property and equipment
535,662 594,653 
Less: Accumulated depreciation and amortization (248,267)(256,939)
Total Property and equipment, net
$287,395 $337,714 
Depreciation and amortization expense, excluding amortization expense related to software development costs, was $4.5 million and $10.8 million for the three and six months ended June 30, 2024, respectively, and $5.7 million and $11.9 million for the three and six months ended June 30, 2023, respectively.
Amortization expense related to software development costs, included as part of Depreciation and amortization expense associated with property and equipment, was $6.3 million and $10.6 million for the three and six months ended June 30, 2024, and $4.0 million and $6.8 million for the three and six months ended June 30, 2023.