Great Lakes Aviation, Ltd. Reports January 2005 Traffic CHEYENNE, Wyo., Feb. 15 /PRNewswire-FirstCall/ -- Great Lakes Aviation, Ltd. (OTC:GLUX) (BULLETIN BOARD: GLUX) today announced preliminary passenger traffic results for the month of January. For the month ending January 31, 2005, compared to the same period in 2004, scheduled service generated 9,170,446 revenue passenger miles (RPM's), a 13.7 percent decrease from the same month last year. Available seat miles (ASM's) declined 25.6 percent to 21,546,876. As a result, load factor increased 5.9 points to 42.6 percent. Passengers carried decreased 10.2 percent to 34,058 when compared with January 2004. JANUARY STATISTICS January 2005 January 2004 Change Passengers Enplaned 34,058 37,922 -10.2% Revenue Passenger Miles (000) 9,170 10,626 -13.7% Available Seat Miles (000) 21,547 28,949 -25.6% Load Factor 42.6% 36.7% 5.9 points Great Lakes is providing scheduled passenger service at 31 airports in nine states with a fleet of Embraer EMB-120 Brasilias and Raytheon/Beech 1900D regional airliners. A total of 160 weekday flights are scheduled at two hubs, with 156 flights at Denver and 4 flights at Phoenix. All scheduled flights are operated under the Great Lakes Airlines marketing identity in conjunction with code-share agreements with United Airlines and Frontier Airlines at the Denver International Airport hub. Additional information is available on the company web site that may be accessed at http://www.greatlakesav.com/ Contact: Dave Thomas, VP Marketing and Planning, (307) 432-7000 DATASOURCE: Great Lakes Aviation, Ltd. CONTACT: Dave Thomas, VP Marketing and Planning of Great Lakes Aviation, Ltd., +1-307-432-7000 Web site: http://www.greatlakesav.com/

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