CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025
Cash flows from operating activities
Net loss	$ (390,181)	$ (595,909)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	19,369	16,314
Asset disposal and other related costs	12,153	2,473
Loss on issuance of convertible preferred stock	0	355,551
Stock-based compensation	49,145	16,819
Acquired in-process research and development	10,797	0
Warrant expense	17,091	308
Non-cash consideration	(5,000)	0
Non-cash interest expense	2,071	1,508
Other	703	185
Net changes in operating assets and liabilities	12,474	19,365
Net cash used in operating activities	(271,378)	(183,386)
Cash flows from investing activities
Purchases of property and equipment	(94,070)	(25,663)
Purchases of aircraft components	(9,702)	0
Proceeds from sale of property and equipment	0	1,296
Net cash used in investing activities	(103,772)	(24,367)
Cash flows from financing activities
Payment of convertible Series C preferred stock issuance costs	(150)	(6,788)
Proceeds from sale-leaseback transaction	0	32,658
Payment of other initial public offering issuance costs	(447)	(217)
Repayment of borrowings	(4,300)	(2,103)
Exercise of stock options	13,047	2,095
Principal payments on finance lease obligations	(51)	(46)
Net cash provided by financing activities	8,099	598,380
Effect of currency translation on cash, cash equivalents, and restricted cash	(119)	(20)
Decrease in cash, cash equivalents, and restricted cash	(367,170)	390,607
Cash, cash equivalents, and restricted cash at beginning of period	1,715,265	302,025
Cash, cash equivalents, and restricted cash at end of period	1,348,095	692,632
Supplemental cash flow information
Cash paid for interest	9,032	7,946
Cash paid for operating leases	3,192	2,703
Non-cash investing and financing activities
Right-of-use assets recognized for new and modified leases	14,484	1,249
Property and equipment included in accounts payable and accrued expenses	23,352	4,147
Aircraft components included in accounts payable and accrued expenses	14,013	0
Stock issuance costs included in accounts payable and accrued liabilities	0	1,773
Deferred offering costs included in accounts payable and accrued expenses	0	6,181
Series C convertible preferred stock
Cash flows from financing activities
Proceeds from convertible preferred stock	0	150,406
Issuance of convertible Series C-1 preferred stock, net of issuance costs
Cash flows from financing activities
Proceeds from convertible preferred stock	$ 0	$ 422,375