Great Lakes Aviation, Ltd. Reports June 2004 Traffic CHEYENNE, Wyo., July 21 /PRNewswire-FirstCall/ -- Great Lakes Aviation, Ltd. (OTC:GLUX) (BULLETIN BOARD: GLUX) today announced preliminary passenger traffic numbers for the month of June. Scheduled service generated 12,037,278 revenue passenger miles (RPM's), a 7.7 percent increase from the same month last year. Available seat miles (ASM's) increased 2.9 percent to 27,706,096. As a result, load factor increased 1.9 points to 43.4 percent. Passengers carried increased 7.3 percent to 43,398 when compared to June 2003. For the six months ending June 31, 2004 compared to the same six-month period in 2003, revenue passenger miles (RPM's) increased 20.5 percent to 64,984,934 while available seat miles (ASM's) increased 3.8 percent to 165,223,702, resulting in a load factor of 39.3 percent for the year 2004 compared to 33.9 percent for the same six-month period in 2003. The company carried 233,124 revenue passengers for the six-month period ending June 30, 2004, an 18.9% increase on a year-over-year basis. JUNE AND YEAR TO DATE STATISTICS Jun-04 Jun-03 Change Passengers Enplaned 43,398 40,435 7.3% Revenue Passenger Miles (000) 12,037 11,180 7.7% Available Seat Miles (000) 27,706 26,918 2.9% Load Factor 43.4% 41.5% 1.9 points YTD 2004 YTD 2003 Change Passengers Enplaned 233,124 195,989 18.9% Revenue Passenger Miles (000) 64,985 53,946 20.5% Available Seat Miles (000) 165,224 159,181 3.8% Load Factor 39.3% 33.9% 5.6 points Great Lakes is providing scheduled passenger service at 36 airports in ten states with a fleet of Embraer EMB-120 Brasilias and Raytheon/Beech 1900D Regional Airliners. A total of 186 weekday flights are scheduled at three hubs, with 176 flights at Denver, 4 flights at Minneapolis/St. Paul, and 6 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 hub. Additional information is available on the company web site that may be accessed at http://www.greatlakesav.com/. For further information please contact Dave Thomas, VP Marketing and Planning of Great Lakes Aviation, Ltd., +1-307-432-7000. 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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