The RAF Gatow Station Flight used two De Havilland Chipmunk T10s to maintain and exercise the British legal right under the Potsdam Agreement to use the airspace over both West and East Berlin, as well as the air corridors to and from West Germany to the city. The aircraft were also used for reconnaissance missions. Known from 1956 as Operation Schooner and then Operation Nylon, they carried out covert photographic reconnaissance flights.