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Great Lakes Airlines Introduces New Station Manager At Worland Municipal Airport 

CHEYENNE, Wyo., June 21, 2004 � Great Lakes Aviation, Ltd. (OTC Bulletin Board: GLUX.OB � news) today announced the appointment of Pennie Hartbank as Station Manager at the Worland Airport, where she is responsible for customer service and ramp operations.

Pennie served most recently as a Customer Service Agent for Great Lakes. She has been working at the airport in Worland since June of 1998 and will be an asset to this position.

�We are pleased to announce Pennie as our local representative in Worland, Wyoming�, said Norma Courtney, VP of Customer Service of Great Lakes. �We have confidence in her abilities and believe she will handle her new responsibilities well.�

Great Lakes is providing scheduled passenger service at 37 airports in 10 states with a fleet of Embraer EMB-120 Brasilia 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 their Denver hub.

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