On August 5, 1975, the airline started service with one round trip flight between Minneapolis, Fargo, and Bismarck North Dakota during the August 1975 Northwest Airlines strike.[3][4][5]
The airline flew displaced passengers between Chicago and Omaha during a 1975 strike by United Airlines machinists.[6] The route also had stop in Des Moines, Iowa.[7]
For one week in May 1978 the airline provided service from Minneapolis, Fargo, and Jamestown North Dakota. Shamrock discontinued service when North Central Airlines inaugurated service on a route from Bismarck, Fargo, North Dakota, Minneapolis and Chicago.[8][9]
Marian Erickson was promoted from vice president to president in December 1978. She succeeded Lee Gilligan, who became Chairman of the Airline.[10]
A charter flight from Minneapolis via Sioux Falls, South Dakota to Harlingen, Texas was offered to see the October 4, 1979 Commemorative Air Force air show.[11]
In 1980 the airline transported Herb Brooks and the U.S. Olympic Hockey Team to Warroad, Minnesota, to play the local high school team.[2]
in 1982 the airline offered chartered 3 and 6 day travel packages to Wollaston Lake Lodge in Saskatchewan Canada.[12]
During a charter flight with passengers from Rochester, Minnesota, a Piper Apache collided with the front end of the company's DC-3 while on the ground in Springfield, Missouri.[13]