A slat is an aerodynamic surface on the leading edge of the wing of a fixed-wing aircraft.

A leading-edge extension is a small extension to an aircraft wing surface, forward of the leading edge.

A leading-edge slot is a fixed aerodynamic feature of the wing of some aircraft to reduce the stall speed and promote good low-speed handling qualities.

The leading-edge droop flap is a device on the leading edge of aircraft wings designed to improve airflow at high angles of attack.