CHEYENNE, Wyo., Oct. 12 /PRNewswire-FirstCall/ -- Great Lakes Aviation, Ltd. (OTC:GLUX) (BULLETIN BOARD: GLUX) today announced preliminary passenger traffic results for the month of September. Scheduled service generated 10,187,000 revenue passenger miles (RPM's), a 5.1 percent decrease from the same month last year. Available seat miles (ASM's) increased 1.2 percent to 24,002,000. As a result, load factor decreased 2.9 points to 42.4 percent. Passengers carried decreased 3.0 percent to 38,637 when compared to September 2004. Preliminary revenue per available seat mile (RASM) increased 10.8 % from 24.66 cents to 27.32 cents. For the nine months ending September 30, 2005 compared to the same nine month period in 2004, revenue passenger miles (RPM's) decreased 10.7 percent to 87,241,000 and available seat miles (ASM's) decreased 12.1 percent to 209,995,000, resulting in a load factor of 41.5 percent for the year 2005 compared to 40.9 percent for the same nine month period in 2004. The company carried 327,959 revenue passengers for the nine month period ending September 30, 2005, a 7.2 percent decrease from the prior year. Preliminary revenue per available seat mile (RASM) increased 15.8% from 22.08 cents to 25.56 cents on a year-over-year basis. SEPTEMBER 2005 AND YEAR TO DATE STATISTICS September 2005 September 2004 Change Passengers Enplaned 38,637 39,829 (3.0%) Revenue Passenger Miles (000) 10,187 10,736 (5.1%) Available Seat Miles (000) 24,002 23,721 1.2% Load Factor 42.4% 45.3% (2.9) points RASM (cents) 27.32 24.66 10.8% YTD 2005 YTD 2004 Change Passengers Enplaned 327,959 353,375 (7.2%) Revenue Passenger Miles (000) 87,241 97,734 (10.7%) Available Seat Miles (000) 209,995 239,030 (12.1%) Load Factor 41.5% 40.9% 0.6 points RASM (cents) 25.56 22.08 15.8% Great Lakes is providing scheduled passenger service at 39 airports in ten states with a fleet of Embraer EMB-120 Brasilias and Raytheon/Beech 1900D regional airliners. A total of 201 weekday flights are scheduled at three hubs, with 176 flights at Denver, 8 flights at Albuquerque, and 25 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 and Phoenix International Airport hubs. Additional information is available on the company web site that may be accessed at http://www.greatlakesav.com/ Contact: Michael Matthews, VP Finance/CFO (307) 432-7000 DATASOURCE: Great Lakes Aviation, Ltd. CONTACT: Michael Matthews, VP Finance/CFO of Great Lakes Aviation, Ltd., +1-307-432-7000 Web site: http://www.greatlakesav.com/

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