Aircastle (AYR) 10-K 2023 FY Annual report

Exhibit 32.1

CERTIFICATION OF

CHIEF EXECUTIVE OFFICER

PURSUANT TO

18 U.S.C. SECTION 1350, AS ADOPTED

PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report on Form 10-K of Aircastle Limited (the “Company”) for the fiscal year ended February 29, 2024, as filed with the Securities and Exchange Commission (the “SEC”) on the date hereof (the “Report”), I, Michael Inglese, as Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002 ("Section 906"), that:

(1)The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the SEC or its staff upon request.

/s/ Michael Inglese

Michael Inglese

Chief Executive Officer

Date: April 25, 2024