Major Jack Leach served with the Royal Flying Corps and the Royal Air Force in World War I and was one of the original members of the Ontario Provincial Air Service. His wooden leg accounted for his nickname' Pegleg' but did not affect his flying ability. He was appointed Superintendent of Western Flying Operations and was put in charge of the winter flying school at Sioux Lookout. Leach was killed in 1930 when his new Hamilton H47 Metalplane crashed into the harbour at Port Arthur. At the time Leach was attempting to complete the third loop in succession.