Airco D.H.4

The D.H.4, one of the most successful aircraft of the First World War, was specially developed as a bomber. After its maiden flight in August 1916, it was fitted with a Rolls-Royce Eagle engine, which improved its flight performance. Approximately 6,300 units were built, more than two-thirds of which were in the United States. Production continued even after the end of the war, and D.H.4s entered service with various air forces and some of the first airlines. (source: Aircraft of the World, IMP BV)