Don't be so quick to convince yourself that a 757 or 767 can be flown by remote control unless you have at least taken the time to read apathoid's paper on how the flight control systems of these airplanes work and the possibilities of flying them by remote control. You can find it here.
I took the time to read over apathoid's essay. For the most part, he is arguing against a remote takeover of an airplane. But in my scenario the airplane is not taken over remotely, but by human hijackers who then rig the cockpit for remote flight. Most of his arguments against the possibility of remote takeover involve the actions of the crew to thwart such a takeover. But that point is moot if the crew is dead when the plane is rigged for remote flight.
At the end of his essay, he considers the possibility of the crew being disabled by some kind of nerve gas, or cabin depressurization. His arguments against such possiblities are probably very good, but he never addresses the scenario I proposed, which is a crew disabled by a couple of bullets to the head.
