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to Call Field, Wichita Falls, Texas, where he remained until April, 1918, when he was sent to Detroit as an inspector on Liberty engines, until after the Armistice.

In 1919, Sinnie organized the Universal Aviation Corporation in Detroit, Michigan, with Henry M. Leland of the Lincoln Motor Car Company as President. This company operated until 1922. Later that year Sinnie bought a Canuck and operated from a field on his father's farm, carrying passengers and giving exhibitions in that vicinity, near Jacksonville, Illinois.

In 1923 he joined the Marie Meyers Flying Circus at St. Louis, putting on exhibitions throughout the Midwest.

In 1924 Sinnie joined his old friend "Shorty" Schroeder, who was with the Underwriters Laboratories in Chicago, Illinois. On June 1, 1925, Schroeder left to become Manager of Ford Airport at Dearborn, Michigan, and one month later Sinnie joined him as his assistant. In 1926, when the Ford Company received an airmail contract between Detroit and Chicago, Schroeder became Pilot No. 1 and Sinnie No. 2 on contract airmail runs, using Stout all-metal planes first, which were single Liberty-engined craft. Later they flew the new tri-motored machines. During 1926 Sinnie flew for his tests and obtained Department of Commerce License No. 624.

In July, 1927, he left Ford and joined Trump Brothers of Minneapolis, Minnesota, to start the Trump Airline, flying between Minneapolis, St. Paul, and Duluth, with a new Buhl Air Sedan powered by a Wright J-5 engine. That winter the run was discontinued due to severe weather and Sinnie took the plane to Hot Springs, Arkansas, to carry passengers. The venture was not successful and the company went out of business.

In the spring of 1928 Sinnie joined Universal Airlines in Chicago and was assigned to the run from Minneapolis, Minnesota, to Fargo, North Dakota, known as the Northern Airline, flying Ryan B-1, Stinson Detroiter, and Fairchild planes. He continued on this run until January 3, 1929, when he and a second

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