In 1938, Grant McConachie, a pioneer in Canadian aviation, expanded United Air Transport's operations to northern Canada and Alaska. To serve these new routes, he acquired the Barkley-Grow T8P-1 airplane, known for its versatility and ruggedness. McConachie's resourcefulness allowed him to obtain these planes at a remarkably low cost, and he rebranded UAT as Yukon Southern Air Transport to better represent the company's operations. The Barkley-Grow, with its unique features and outstanding performance, played a vital role in establishing modern air travel in the rugged northern territories. Yukon Southern also contributed to the development of the Alaska Highway, underscoring the significant impact of McConachie and his aircraft.