Inside 9/11 - Who Controlled the Planes? by WASHINGTONS BLOG/ INSIDE 911 FILMS
Airplanes Have Been Flown By Remote Control Since 1917
(9/11/2011) Airplanes have been flown by remote-control since 1917.
As Wikipedia notes:
"In 1917, Archibald Low as head of the RFC [Britain's Royal Flying Corps] Experimental Works, was the first person to use radio control successfully on an aircraft.
"There were also [during the 1930s] remotely controlled cutters and experimental remotely controlled planes in the Red Army. In the 1930s Britain developed the radio controlled Queen Bee, a remotely controlled unmanned Tiger Moth aircraft for a fleets gunnery firing practice.