A modern view of Bletchley Park showing a celebratory fly over by a Douglas DC3 Flying over Mansion. The DC-3 is an American fixed-wing, propeller-driven aircraft whose speed and range revolutionized air transport in the 1930s and during World War Two in the 1940s and is regarded as one of the most significant transport aircraft ever made. Buy this picture as an unframed print, a mounted box canvas print, or a framed print.