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Edward Lee at the University of California in Berkeley has proposed a powerful defense against terrorist use of hijacked planes.
Lee and his colleagues … propose modifying the avionics in aircraft so that the plane would fight any efforts by the pilot to fly into restricted airspace. So if a plane was flying with a no-fly-zone to the left, and the pilot started banking left to enter the zone, the avionics would counter by banking right. Lee’s system, called “soft walls”, would first gently resist the pilot, and then become increasingly forceful until it prevailed.
This sounds like it would work.
