Airliners already have a kind of panic button to tell the ground that they are being hijacked. Imagine that this would also put the plane under control from the ground with no pilot overrides. Now, imagine that the plane is diverted to a military airport.
The only option left the hijackers would be to blow up the plane, but (sad to say) blowing up a plane with 70 or 80 people in it is preferable to a repeat of what happened on Tuesday.
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