Flaperon

Boeing 777 flaperon
Flaperons on a Denney Kitfox Model 3, built in 1991
Flaperons (Junkers style) on an ICP Savannah Model S, built in 2010
Work of the flaperon of Boeing 777

A flaperon (a portmanteau of flap and aileron) on an aircraft's wing is a type of control surface that combines the functions of both flaps and ailerons. Some smaller kitplanes have flaperons for reasons of simplicity of manufacture, while some large commercial aircraft such as the Boeing 747, 767, 777, and 787 may have a flaperon between the flaps and aileron. The 787 has a configuration known as a SpoileFlaperon that combines the action of spoilers, flaps and ailerons into one control surface.