Great Lakes Airlines

CHEYENNE, Wyo., July 11, 2011 — Great Lakes Aviation, Ltd. (OTC Bulletin Board: GLUX.OB — news) today announced the addition of a 4th non-stop round trip from Dickinson to Denver International Airport effective July 10, 2011.

Following is the Dickinson flight schedule effectiveJuly 10, 2011:

Dickinson to Denver:

Flight 7131 Departs 6:00a Arrives 7:58a Operates Daily

Flight 7139 Departs 7:10a Arrives 9:08a Operates Daily

Flight 7135 Departs 1:10p Arrives 3:08p Operates Daily

Flight 7137 Departs 2:16p Arrives 4:14p Operates Daily

Denver to Dickinson:

Flight 7134 Departs 10:25a Arrives 12:26p Operates Daily

Flight 7136 Departs 11:55a Arrives 1:56p Operates Daily

Flight 7140 Departs 5:45p Arrives 7:46p Operates Saturday

Flight 7132 Departs 6:55p Arrives 8:56p Operates Daily

Flight 7140 Departs 8:55p Arrives 10:56p Operates Sunday-Friday

Great Lakes is providing scheduled passenger service at 44 airports in fourteen states with a fleet of Embraer EMB-120 Brasilias and Raytheon/Beech 1900D regional airliners. A current route map may be viewed at http://www.flygreatlakes.com/route_map/route_map.htm .

All scheduled flights are operated under the Great Lakes Airlines marketing identity in conjunction with code-share agreements with United Airlines and/or Frontier Airlines at their Albuquerque, Denver, Las Vegas, Los Angeles and Phoenix hubs.

Additional information about Great Lakes Airlines is available at www.flygreatlakes.com