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Class of Warrant or Right, Vested During the Period

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Other Warrant Expense

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Purchase Agreement, Number of Aircraft

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Share-based Compensation Arrangement by Share-based Payment Award, Conversion Ratio

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Holders Ownership Once Grants Are Fully Vested

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Share-based Compensation Arrangement by Share-based Payment Award, Founder Grants, Number Of Tranches

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Share-based Compensation Arrangement by Share-based Payment Award, Founder Grants, Vesting Percentage Upon Achievements

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Share-Based Compensation Arrangement By Share-Based Payment Award, Increase In Number Of Shares Available For Grant, Percentage Of Shares Outstanding

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Share-Based Compensation Arrangement By Share-based Payment Award, Maximum Shares Issuable

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Share-based Compensation Arrangement by Share-based Payment Award, Milestone Achievement Period

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Exercise price per share or per unit of warrants or rights outstanding.

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Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.

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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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Aggregate number of common shares reserved for future issuance.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Amount of other research and development expense.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Number of shares authorized for issuance under share-based payment arrangement.

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Percentage of vesting of award under share-based payment arrangement.

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Purchase price of common stock expressed as a percentage of its fair value.

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Stock-Based Compensation - Narrative (Details) $ / shares in Units, $ in Millions				1 Months Ended			3 Months Ended
	Sep. 15, 2021 shares	Jul. 19, 2021 installment $ / shares shares	Jan. 29, 2021 aircraft milestone installment $ / shares shares	Feb. 28, 2022 shares	Sep. 30, 2021	Aug. 31, 2021 shares	Mar. 31, 2022 USD ($) milestone shares	Mar. 31, 2021 USD ($)	Sep. 16, 2021 tranche	Nov. 06, 2020 milestone $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense \| $							$ 24.5	$ 0.9
Founder grants, vesting percentage upon achievements	25.00%
Number of conditional purchased aircraft \| aircraft			200
Option to purchase of additional aircraft \| aircraft			100
Research and development \| $							27.5	10.1
Other warrant expense \| $							0.0	78.2
Research and development warrant expense \| $							$ 1.2	0.0
FCA Italy S.p.A.
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of vesting installments \| installment		2
Warrants For Collaboration Agreement With United Airlines Inc.
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Class of warrant or right, vested during the period (in shares) \| shares							8,845,058
Warrants For Collaboration Agreement With United Airlines Inc. \| United Airlines Inc.
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants, issued or issuable (in shares) \| shares			14,741,764
Warrants price per share (in dollars per share) \| $ / shares			$ 0.01
Number of vesting installments \| installment			4
Number of vesting milestones \| milestone			4
Warrants For Collaboration Agreement With FCA US LLC \| FCA US LLC
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants price per share (in dollars per share) \| $ / shares										$ 0.01
Research and development \| $							$ 0.1	0.1
Number of vesting milestones \| milestone							5			7
Class of warrant or right, vested during the period (in shares) \| shares							1,236,690
Number of securities called by warrants or rights (in shares) \| shares										1,671,202
Warrants For Collaboration Agreement With FCA Italy S.p.A \| FCA Italy S.p.A.
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants price per share (in dollars per share) \| $ / shares		$ 0.01
Number of securities called by warrants or rights (in shares) \| shares		1,077,024
Related service period		12 months
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense \| $							$ 19.1	0.2
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense \| $							5.4	0.7
Research and development \| Warrants For Collaboration Agreement With FCA Italy S.p.A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Research and development warrant expense \| $							1.2
Options to purchase common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense \| $							1.0	0.9
Unvested stock options \| $							$ 12.7
Weighted-average period							1 year 3 months 18 days
Unvested restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of annual bonus target amount							25.00%
Total stock-based compensation expense \| $							$ 5.7	$ 0.1
Weighted-average period							2 years 3 months 18 days
Granted (in shares) \| shares	20,009,224						1,462,209
Holders ownership once grants are fully vested	18.00%
Milestone achievement period	7 years
Founder grants, number of tranches \| tranche									4
Vested (in shares) \| shares							300,014
Share-based payment arrangement, nonvested award, cost not yet recognized, amount \| $							$ 300.1
Unvested restricted stock units \| General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense \| $							16.0
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of outstanding stock maximum						1.00%
Purchase price of common stock, percent						85.00%
Number of shares authorized (in shares) \| shares						4,969,059
Number of additional shares authorized (in shares) \| shares						9,938,118
2021 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion ratio				1
2021 Stock Plan \| Cliff Vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				1 year
2021 Stock Plan \| Unvested restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) \| shares				1,462,209
2021 Stock Plan \| Unvested restricted stock units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				3 years
Award vesting rights, percentage				25.00%
2021 Stock Plan \| Unvested restricted stock units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				4 years
Award vesting rights, percentage				33.00%
Quarterly Equity Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense \| $							$ 1.8
Common Class A \| Warrants For Collaboration Agreement With United Airlines Inc. \| United Airlines Inc.
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of securities called by each warrant or right (in shares) \| shares			1
Common Class A \| 2021 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Capital shares reserved for future issuance (in shares) \| shares						7,453,588	3,255,791
Percentage of outstanding stock maximum					2.00%
Common Class A \| 2021 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Capital shares reserved for future issuance (in shares) \| shares							1,627,895
Common Class B \| Unvested restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested (in shares) \| shares							5,002,306