Monarch Air Lines was an American local service airline based in Denver, Colorado, that began its scheduled air service on November 27, 1946, with a flight from Denver to Durango, Colorado, using a Douglas DC-3.
Other services started to Albuquerque, Salt Lake City and Grand Junction.
Monarch pioneered all-weather operations in its service area by installing its own navigational system.
They became Frontier "Sunliners" named Arizona, New Mexico, Royal Gorge, Mesa Verde and Utah.
Monarch was serving the following destinations on a daily basis with Douglas DC-3 aircraft during the late 1940s:[1]