Great Lakes Aviation 

Great Lakes Aviation, Ltd. is a regional air service provider in the United States, operating both independently and as a codeshare partner with United Air Lines, Inc. The company provides regular passenger flights to its designated hubs under the Great Lakes brand, and also transports cargo on these scheduled services. By March 20, 2015, its network covered 28 airports across nine states, utilizing a fleet composed of six Embraer EMB-120 Brasilias and twenty-eight Beechcraft 1900D regional aircraft. Founded in 1979, its principal office is located in Cheyenne, Wyoming.