FOR IMMEDIATE RELEASE Contact:      Dave Thomas, VP Marketing and Planning

             (307) 432-7000

Great Lakes Airlines Announces Service to Sierra Vista, AZ

CHEYENNE, Wyo., February 8, 2005 � Great Lakes Aviation, Ltd. (OTC Bulletin Board: GLUX.OB � news) today announced new service will commence on March 1, 2005, from Phoenix, Arizona to Sierra Vista, Arizona. 

�Great Lakes is proud to provide service into Sierra Vista�, said Dave Thomas VP of Marketing and Planning for Great Lakes. "The community has been without air service for several years and Great Lakes is grateful for the opportunity to provide Sierra Vista with its convenient & reliable service."

Following is the Sierra Vista flight schedule effective March 1, 2005:

Sierra Vista to Phoenix:

Flight 5196  Departs 11:20a  Arrives   12:15p  Operates Monday-Saturday

Flight 5198 Departs  4:55p Arrives    5:50p Operates Sunday-Friday

Phoenix to Sierra Vista City:

Flight 5195  Departs 10:15a Arrives  11:10a Operates Monday-Saturday

Flight 5197 Departs  3:50p Arrives    4:45p Operates Sunday-Friday

As of March 1, Great Lakes will be providing scheduled passenger service at 34 airports in ten states with a fleet of Embraer EMB-120 Brasilia and Raytheon/Beech 1900D Regional Airliners. A total of 162 weekday flights are scheduled at two hubs, with 156 flights at Denver 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 their Denver hub.

Additional information is available on the Company web site that may be accessed at www.greatlakesav.com