The Airco DH-1 was a British two-seater bi-plane designed by Geoffrey de Havilland for the Aircraft Manufacturing Company. The aircraft first began to be used by the Royal Flying Corps in the summer of 1915. It was replaced by the Airco DH-2 single-seat biplane in February 1916. Despite a lack of speed and an unreliable engine, the DH-2 was more manoeuvrable than German Fokker E- types and helped to establish allied air supremacy over Germany during the Battle of the Somme.