The FF9 Kaje was a Norwegian trainer aircraft, designed and built by the Norwegian Army Air Service's aircraft manufacturer Kjeller Flyfabrikk.

The models differed slightly in wing profile, wingspan and rudder surfaces, based on experience with the previous model.

The Kaje was a well built aircraft, constructed primarily of wood with fabric covering, with a good engine, but it had bad spin characteristics.

Although primarily used as a training plane and for reconnaissance, the aircraft could also carry arms and was tested with radio equipment.

General characteristics Performance