The Stinson Detroiter was the first operational airliner of Northwest Airways (predecessor to Northwest Airlines), and it is notable for having a soundproofed and heated cabin. In the region of 36 of this braced high-wing monoplane were produced in a number of versions. Later builds had the more powerful J-6 Wright engine, and some earlier builds were later retro-fitted with the type. Detroiters were involved in a number of long-distance and pioneering flight exploits, but one notable first involved a Detroiter acquired by Packard Motor Co. It was fitted with a diesel engine, and on 19 September 1928 it was to become the first diesel-powered aircraft to fly.