Great Lakes Aviation (GLUX) 10-Q 2004 Q2 Quarterly report

EXHIBIT 32.2

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 Great Lakes Aviation, Ltd. (“Company”) for the quarterly period ended June 30, 2004 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Michael L. Tuinstra, Treasurer (Principal Accounting and Financial Officer) of the Company, certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1034, 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.

Dated: August 18, 2004	By:	/s/ Michael L. Tuinstra
		Michael L. Tuinstra
		Treasurer (Principal Accounting and Financial Officer)