Wikipedia
Idflieg
The Idflieg (Inspektion der Fliegertruppen - "Inspectorate of Flying Troops") was the bureau of the German Empire that oversaw German military aviation prior to and during World War I.
Founded in 1911, the Idflieg was part of the Luftstreitkräfte, handling administration including regulation of service designations applied to aircraft produced by domestic companies, characterised according to the armament, wing configuration, crew, and role which was intended for the aircraft.