One of three ex USAAF P-39Cs shipped to the UK for trials of its 37mm cannon. The RAF had specified the 20mm Hispano-Suiza cannon for the P-39s it had received earlier but had quickly rejected. Those aircraft were shipped to the Soviet Union and there were no Airacobras in RAF service when the trials aircraft arrived. The 37mm cannon was being assessed as a ground attack weapon. The test trio were apparently scrapped at the end of the trial. Photo from: Imperial War Museums

This was the aircraft flown by the famous test pilot, Eric 'Winkle' Brown. It was the first tricycle undercarriage aircraft to land on an aircraft carrier. Seen in an advanced state of decay at Farnborough

The RAF ordered 676 Airacobras in April 1940 but performance was far below expectations. No 601 Sqn flew one operational mission, on 9 October 1941, before most of these aircraft were diverted to the Soviet Union. AH621 however went to the RCAF. It crashed on 26 November 1941 near RCAF Rockcliffe, only two weeks after the reported date this photo was taken near the Bell factory in Niagara Falls. Photo by: Rudy Arnold / Smithsonian Institution