Property, plant and equipment, net consisted of the following (in thousands):


	March 31,			December 31,
	2026			2025
Transplant aircraft	$	295,563		$	295,527
Transplant aircraft equipment		3,100			3,100
Flight school aircraft		3,717			3,717
OCS Consoles		26,930			24,590
Manufacturing equipment		13,476			12,101
Computer equipment and software		3,378			3,376
Internal-use software		14,240			12,413
Laboratory equipment		4,080			3,698
Office, trade show and training equipment		5,400			5,260
Building		20,352			—
Leasehold improvements		25,720			25,113
Construction-in-progress		3,158			2,174
Land		16,279			2,652
		435,393			393,721
Less: Accumulated depreciation and amortization		(73,822	)		(66,065	)
	$	361,571		$	327,656

During the three months ended March 31, 2026 and 2025, total depreciation and amortization expense, including finance lease amortization (see Note 10), was $9.9 million and $6.1 million, respectively.

The Company capitalized costs associated with the development of internal-use software of $1.9 million and $1.8 million during the three months ended March 31, 2026 and 2025, respectively, and recorded amortization expense of $0.7 million during the three months ended March 31, 2026. There was no amortization recorded during the three months ended March 31, 2025 as internal-use software had not yet been placed in service. The net book value of internal-use software was $12.4 million and $11.2 million as of March 31, 2026 and December 31, 2025, respectively, of which $0.2 million and $0.1 million was included in construction-in-progress as of those respective dates.