Great Lakes Aviation, Ltd., a regional airline company, operates as an independent carrier and code share partner with United Air Lines, Inc. in the United States. The company offers scheduled air service to its hubs under the Great Lakes brand; and carries cargo on its scheduled flights. As of March 20, 2015, it served 28 airports in 9 states with a fleet of 6 Embraer EMB-120 Brasilias and 28 Beechcraft 1900D regional airliners.