The estimated useful lives are as follows:
AssetUseful Life
Buildings39 years
Flight vehicles and rotables
2 to 20 years
Machinery and equipment
2 to 7 years
Information technology software and equipment
3 to 6 years
Leasehold improvementsShorter of the estimated useful life or lease term
Property, plant and equipment consists of the following:
December 31,
20252024
(In thousands)
Land$1,302 $1,302 
Buildings10,111 10,111 
Flight vehicles and rotables4,331 4,331 
Machinery and equipment44,913 42,792 
Information technology software and equipment52,130 45,553 
Leasehold improvements77,853 77,589 
Construction in progress302,726 117,810 
493,366 299,488 
Less: accumulated depreciation and amortization
104,63690,374
$388,730 $209,114 

Historical Timeline

Fiscal YearFiled
2025Mar 30, 2026Showing above
2024Feb 26, 2025
2023Feb 27, 2024
2022Feb 28, 2023
2021Feb 28, 2022
2020Mar 1, 2021
2019Feb 28, 2020

About PP&E Disclosures

The PP&E disclosure details a company's physical asset base — land, buildings, machinery, and equipment — along with the depreciation methods and useful life assumptions that determine how these costs flow through the income statement. Capitalization policy thresholds reveal management's judgment on the boundary between expense and asset, directly affecting both reported earnings and asset values.

Key signals: changes in estimated useful lives or depreciation methods can materially shift reported earnings without any operational change. Compare capital expenditures against depreciation expense — when capex consistently trails depreciation, the asset base may be aging and underinvested. Watch for large asset impairments or write-downs that signal overvalued carrying amounts. Asset retirement obligations reveal future environmental or decommissioning costs that are often underappreciated. Compare PP&E intensity (PP&E-to-revenue) against industry peers to assess capital efficiency and competitive positioning.