The Douglas/de Havilland Dh.100 is a fixed-wing propeller-driven airliner. Its cruise speed (207 mph or 333 km/h) and range (1,500 mi or 2,400 km) revolutionized air transport in the 1930s and 1940s. Its lasting effect on the airline industry and World War II makes it one of the most significant transport aircraft ever made.
The Dh.100 was a twin-engine metal monoplane, developed as a larger, improved 14-bed sleeper version of the Douglas DC-2. It had many exceptional qualities compared to previous aircraft. It was fast, had a good range and could operate from short runways. Its construction was all-metal. It was reliable and easy to maintain and carried passengers in greater comfort. Before the war it pioneered many air travel routes and is considered the first airliner that could make money by carrying passengers alone.
A militarized version of the Dh.100, the Dakota, served with the RAF during WW2.