EX-32.1 5 fly-ex32_1.htm EX-32.1

Exhibit 32.1

Certification 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 Quarterly Report on Form 10-Q of Firefly Aerospace Inc. (the “Company”) for the quarter ended March 31, 2026 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Jason Kim, as Chief 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 the best of my knowledge:

1.
The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and
2.
The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: May 4, 2026 |  | By: | /s/ Jason Kim
|  |  | Chief Executive Officer
|  |  | (Principal Executive Officer)