Air Ontario
[3][1] In 1969, Great Lakes was only operating between Sarnia and Toronto as an independent air carrier with just two roundtrip nonstop flights primarily flown on weekdays with Douglas DC-3 aircraft.[5] However, by 1975 Great Lakes was in financial trouble which resulted in the Sarnia - Toronto route being the only scheduled passenger service operated at this time and also led to the airline being purchased by a partnership consisting of a group of Toronto businessmen including James Plaxton, who brought in new capital from the DeLuce family when he merged Great Lakes with their Austin Airways operation.In 1977, the airline moved its headquarters from Sarnia to London, Ontario and also purchased Flightexec Ltd. which was based in London and operated executive charters with Piper Aztec twin prop business aircraft with Great Lakes continuing to operate Flightexec as a separate air carrier.Marie, ON, Sudbury, ON, North Bay, ON, London, ON and Sarnia plus two destinations in the U.S., being Cleveland and Hartford with the airline also ordering new de Havilland Canada DHC-8 Dash 8 turboprops at this time.The following cities in Canada and the U.S. were being served at this time primarily via nonstop service to and from Toronto with all flights being operated with Dash 8 turboprops.