Last night my dad made a suggestion about which I know little. He argued that the electronics exist to set up a system for backup ground override of a/c controls, similar to the manner of 'smart bombs' used in the Gulf War.
Human pilots would still fly planes, but every a/c would have a TV camera in its nose and an onboard computer which could be directed from the ground to shut down the a/c's controls and fly the aircraft from the ground. Presumably, terrorists would not be able to fly a hijacked a/c. If the plane changed flight plan, ATC could simply override the controls and fly the plane to the nearest military facility in an unpopulated area and land the plane.
One interesting possibility: a/c approaching or departing DCA would be required to be operated this way. Pilots would take over once out of DC region airspace.
I'm not familiar with this technology and don't know if it is feasible; my dad thinks that it is. How practical or feasible is this suggestion? From an electronics or financial point of view?