Boeing 777 flaprons
Flaprons are flight control surfaces on the wing that combine the functions of flap and aileron. It is deployed during takeoff and landing where high lift and significant drag is required. Two actuators that receive inputs from flight control computer that translates pilots command move the Flaprons. Since it is made of composite material and its hollow shape, the Boeing 777 Flapron is managed to float for a long time and drift to the shore

Image source: wikipedia