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

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Great Lakes Airlines To Upgrade Equipment Between Rock Springs, Wyoming and Denver, Colorado Beginning March 1, 2004

CHEYENNE, Wyo., February 10, 2004 � Great Lakes Aviation, Ltd. (OTC Bulletin Board: GLUX.OB� news) today announced that beginning March 1, 2004, it will upgrade its schedule of flights between Denver International Airport and Rock Springs, Wyoming, by adding 30 seat EMB-120 Brasilia aircraft to the schedule pattern.  This cabin class aircraft, used to replace one of the three Beech 1900 round trips currently serving the market, offer flight attendants and lavatories for the non-stop trip to and from Denver.

�Great Lakes is happy to announce this service upgrade for our customers in Rock Springs,� Charles R. Howell IV, CEO of Great Lakes, commented. �The growth in traffic we�ve seen between Rock Springs and Denver has been steady, and warrants this increase in capacity, which will allow more people to enjoy the convenient service and economical fares we offer.�

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

Rock Springs � Denver Flight Schedule (Effective March 1, 2004)

Rock Springs to Denver:

Flight 5110  Departs 6:20am Arrives 7:30am Operates Monday-Friday

Flight 5110 Departs 6:40am Arrives 7:50am Operates Saturday-Sunday Only

Flight 5112 Departs 10:35am Arrives 11:45am Operates Monday-Saturday

Flight 5112* Departs 1:19pm  Arrives 2:20pm Operates Sunday Only

Flight 5116* Departs 4:19pm  Arrives 5:20pm Operates Monday-Friday

Denver � Rock Springs Flight Schedule (Effective March 1, 2004)

Denver to Rock Springs:

Flight 5111  Departs 9:00am Arrives 10:20am Operates Monday-Saturday

Flight 5111* Departs 11:39am Arrives 12:49pm Operates Sunday Only

Flight 5115* Departs 2:35pm  Arrives 3:45pm Operates Monday-Friday

Flight 5115 Departs 6:20pm Arrives 7:40pm Operates Saturday Only

Flight 5117 Departs 8:55pm Arrives 10:15pm Operates Sunday-Friday

* = Will operate in EMB-120 Brasilia Equipment

As of February 1, 2004, Great Lakes is providing scheduled passenger service at 41 airports in eleven states with a fleet of Embraer EMB-120 Brasilia and Raytheon/Beech 1900D Regional Airliners.  A total of 194 weekday flights are scheduled at three hubs, with 184 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

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