9/11 Mastermind Zakheim: Hijack the Hijackers Tool Misused

The planes that hit the World Trade Center buildings had remote control capability designed to regain control of a hijacked plane. Instead, the tool, overseen by Dov Zakheim, was used to ensure that the planes hit their target, given that the hijackers were mere amateurs.
Source:
pesn.com/2011/09/20/9501917_9-11-Mastermind-Zakheim_Hijack-the-Hijackers_Tool_Misused/