Supermarine Spitfire HF VII
Credit: NASA Langley Research Center
This Supermarine Spitfire HF VII was one of the high-altitude versions of the famous fighter, its normal elliptical wingtips replaced by extended "pointed" tips for its high-altitude role. This is one of the Langley aircraft that has survived, seen in a photo taken on September 8, 1948. It is in the Smithsonian Institution's National Air and Space Museum's collection.