Segments (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Research and development expenses		$ 44,873	$ 32,419	$ 135,256	$ 96,191
Total segment loss		(44,873)	(32,419)	(135,256)	(96,191)
Expenses (income) not allocated to segments, net	[1]	768	2,942	23,978	(164)
Loss before income taxes		(45,641)	(35,361)	(159,234)	(96,027)
eVTOL
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Research and development expenses		42,551	29,965	128,208	88,047
Service and Operations Solutions
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Research and development expenses		1,674	1,026	4,540	4,299
UATM
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Research and development expenses		$ 648	$ 1,428	$ 2,507	$ 3,846

[1] Includes SG&A expenses and other non-operating income and expenses not allocated to each segment