The term AIRPLANE FEATURE can be summarized by the solution PROPELLER, which is a nine letter word. A PROPELLER is a type of fan that is used to generate thrust for an aircraft. It consists of two or more blades that rotate around a central hub, and is powered by an engine. Propellers are used to provide lift and thrust for airplanes, helicopters, and other types of aircraft. They are also used to propel boats and ships.