Joinder Agreement, dated September 10, 2021, by and between the Company and Patrick M. Shanahan

Exhibit 10.1

JOINDER AGREEMENT

September 10, 2021

By executing this joinder, the undersigned hereby agrees, as of the date first set forth above, that the undersigned (i) shall become a party to that certain Letter Agreement, dated November 19, 2020 (as may be amended or restated from time to time, the “Letter Agreement”), by and among Zanite Acquisition Corp. (the “Company”), Zanite Sponsor LLC (the “Sponsor”), and the executive officers and directors of the Company, solely with respect to paragraphs 1, 2, 6, 7(a), 7(c), 8, 9 and 10 of the Letter Agreement, and shall be bound by, and entitled to the rights provided under, the terms and provisions of such sections of the Letter Agreement as an Insider (as defined therein) solely with respect to the 5,050,000 Class B ordinary shares of the Company held by it (the “Founder Shares”); and (ii) shall become a party to that certain Registration Rights Agreement, dated November 19, 2020 (as may be amended or restated from time to time, the “Registration Rights Agreement”), by and among the Company, the Sponsor and the other Holders signatory thereto (as defined therein), and shall be bound by the terms and provisions of the Registration Rights Agreement as a Holder and entitled to the rights of a Holder under the Registration Rights Agreement and the Founder Shares shall be “Registrable Securities” thereunder.

[Signature Page Follows]

ACKNOWLEDGED AND AGREED:

ZANITE ACQUISITION CORP.

[Signature Page to Joinder Agreement]