Lethbridge Airport had become more regional in nature. According to Trans-Canada's system timetable dated April 29, 1962, the airline was operating Vickers Viscount turboprop service on a routing of Lethbridge-Calgary-Edmonton and was also flying Douglas DC-3 service with a routing of Lethbridge-Medicine Hat-Swift Current-Regina-Yorkton-Brandon-Winnipeg. Trans Canada would become Air Canada which in turn continued to operate Vickers Viscount turboprop service on the Lethbridge-Calgary-Edmonton route before ceasing all scheduled passenger service to Lethbridge during the early 1970s. Time Air was a regional airline that initiated operations in Lethbridge. Founded in 1966 as Lethbridge Air Service, Time Air flew a variety of turboprop aircraft
Vickers Viscount TAA. Unstated was the requirement for both airlines to have identical equipment. The first North American airline to use turboprop aircraft was Trans-Canada Air Lines (TCA), with a small fleet of Type 700 Viscounts. Initially, TCA was cautious of the Viscount due to the turboprop engine being a new technology, and there had been a preference for acquiring the piston-engined Convair CV-240 instead; praise of the Viscount from pilots and a promise from Vickers to make any design changes desired by TCA persuaded it to procure the Viscount instead. On 6 December 1954, the first Viscount was delivered to Canada