FOR IMMEDIATE RELEASE           Contact: Monica Taylor, Director of Sales and Marketing

                    (307) 432-7000

 Great Lakes Airlines Begins Service Between Phoenix and Show Low, Arizona.

CHEYENNE, Wyo., April 19, 2005 � Great Lakes Aviation, Ltd. (OTC Bulletin Board: GLUX.OB � news) today announced new service will commence on May 1, 2005, from Phoenix, Arizona to Show Low, Arizona.

�Great Lakes is pleased to be selected by the USDOT to provide Essential Air Service to Show Low, Arizona,� said Monica Taylor, Director of Sales and Marketing for Great Lakes Airlines.  "This new service to Show Low will connect people to the White Mountain Region in our continued expansion in Arizona." 

Following is the Show Low flight schedule effective May 1, 2005:

Show Low to Phoenix:

Flight   Departure   Arrival   Operates

5190     8:32a     9:10a  Monday-Friday

5190   12:53p      1:40p   Saturday & Sunday

5192     3:16p     4:03p  Saturday

5192     5:36p     6:23p  Sunday-Friday

Phoenix to Show Low

Flight   Departure   Arrival   Operates

5189     7:17a     8:03a  Monday-Friday

5189   11:47a    12:33p  Saturday & Sunday

5191   2:10p     2:56p  Saturday

5191   4:30p     5:16p  Sunday-Friday

As of April 3, Great Lakes will provide scheduled passenger service at 36 airports in ten states with a fleet of Embraer EMB-120 Brasilia and Raytheon/Beech 1900D Regional Airliners. All scheduled flights are operated under the Great Lakes Airlines marketing identity in conjunction with code-share agreements with Frontier Airlines and United Airlines.

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