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

       (307) 432-7000

Great Lakes Airlines To Add Weekend Flight Between Sheridan, Wyoming and Denver, Colorado Beginning June 3, 2004

CHEYENNE, Wyo., June 2, 2004 � Great Lakes Aviation, Ltd. (OTC Bulletin Board: GLUX.OB � news) today announced that beginning June 3, 2004, it will increase weekend scheduled flights between Denver International Airport and Sheridan, Wyoming.

�Great Lakes is proud to announce this service increase for our customers in Sheridan,� Dave Thomas, VP of Marketing and Planning of Great Lakes, commented.  �The growth in traffic we�ve seen between Sheridan and Denver has been steady, and the comments we�ve received regarding the need for more frequency in the market leads us to believe this improvement in the schedule will result in more people enjoying the convenient service and economical fares we offer.�

All flights in the market are timed to make convenient connections with flights scheduled by Frontier Airlines and United Airlines from Denver.

Sheridan � Denver Flight Schedule (Effective June 3, 2004)

Sheridan to Denver:

Flight 5152  Departs   6:00am Arrives  7:33am Operates Monday-Friday

Flight 5152 Departs  7:20am Arrives   8:53am Operates Saturday Only

Flight 5152 Departs  8:45am Arrives 10:18pm Operates Sunday Only

Flight 5156 Departs 11:20am Arrives 12:45pm Operates Monday - Saturday

Flight 5156* Departs 11:20am Arrives 12:53pm Operates Sunday Only

Flight 5150 Departs  3:50pm Arrives  5:23pm Operates Daily

Flight 5154 Departs  5:26pm Arrives   6:59pm Operates Sunday Only

Denver � Sheridan Flight Schedule (Effective June 3, 2004)

Denver to Sheridan:

Flight 5156* Departs  9:25am Arrives 10:48am Operates Sunday Only

Flight 5156 Departs  9:25am Arrives 10:50am Operates Monday - Saturday

Flight 5153 Departs  1:55pm Arrives  3:31pm Operates Daily

Flight 5154 Departs  3:40pm Arrives   5:16pm Operates Sunday Only

Flight 5151 Departs  6:05pm Arrives   7:46pm Operates Saturday Only

Flight 5154 Departs  6:55pm Arrives   8:31pm Operates Monday - Friday

Flight 5151 Departs  8:15pm Arrives   9:51pm Operates Sunday Only

* = Operation on Weekend

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 174 weekday flights are scheduled at three hubs, with 164 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 Frontier Airlines and United Airlines at their Denver hub.

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

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