Document

Exhibit 32.1

CERTIFICATIONS PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

The following certifications are hereby made in connection with the Annual Report on Form 10-K of Harbor Diversified, Inc. (the “Company”) for the period ended December 31, 2024, as filed with the Securities and Exchange Commission on the date hereof (the “Report”):

I, Christine R. Deister, Principal Executive Officer of the Company, hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge, (i) the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, and (ii) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company as of the dates and for the periods presented.


Date: April 8, 2026	By:	/s/ Christine R. Deister
		Christine R. Deister
		Chief Executive Officer and Secretary
		Harbor Diversified, Inc.
		(Principal Executive Officer)

I, Gregg Garvey, Principal Financial Officer of the Company, hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge, (i) the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, and (ii) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company as of the dates and for the periods presented.


Date: April 8, 2026	By:	/s/ Gregg Garvey
		Gregg Garvey
		Executive Vice President and Chief Financial Officer
		Harbor Diversified, Inc.
		(Principal Financial and Accounting Officer)