Otto C.I

The Bavarian air service was independent of Prussian control until some time in 1915, and they still preferred pusher aircraft for observation. The Otto C.I, also known as the KD.15, was an attempt to update the old Otto Pusher Biplane formula with an armed and more powerful type. Twin booms gave the C.I an distinctive look, later leveraged in Ago designs.

Seven (including the prototype) were used for a short time by Bavarian units before being relegated to training duties. Another twelve were sent to Bulgaria, where they were used for bombing and reconnaissance before replacement, at which time they also became trainers. The Bulgarian C.I's were in use from Spring 1916 until some time in 1917.