 Parker was a long-time member of the Guild of Air Pilots and Air Navigators, serving as its Master from 1951 until 1953 and again from 1956 until 1957.In 1948 he was the first recipient of the Guild's Brackley Memorial Trophy, "awarded to a transport pilot(s) or navigator(s), for outstanding flying, contributing to the operational development of air transport, or transport aircraft, or of new techniques in air transport flying.