In October 1952 Wisconsin Central scheduled flights to 28 airports, all west of Lake Michigan, from Chicago to Fargo and Grand Forks. It added Detroit in 1953, Omaha, and the Dakotas in 1959, Denver in 1969, and nonstop flights from Milwaukee to New York LaGuardia in 1970. It added five Convair 340s from Continental Airlines to its fleet of DC-3s, the first ones entering service in 1959. In 1960 North Central hit the one million passenger mark; in May 1968, it flew to 64 airports, including two in Canada. Turbine flights (Convair 580s) started in April 1967.