Boeing 737 from 300 onwards have a WAI system that can operate on the ground. It has temp sensors in the leading edge that open and close the valves. When the throttles are advanced, the valves are closed (for performance reasons, WAI uses a lot of air), and when the aircraft lifts off the system closes the valves and trips to OFF.
The B737-200 ( and some early -300s)
all have WAI that is inhibited on the ground, in fact the B747-400 is inhibited with the leading edge flaps not UP.
p.s. A320 also inhibited on the ground.