It's too late now, but...

Couldn't a biometric system be created to not allow anyone but 'authorized'
crew to control the aircraft? In the event of someone else taking the
controls a beacon could be enabled to tell ground crew of the fact, and the
controls locked out.

Seems like such a system could be possible, though I can't see all airlines
paying the expense to install such a system.

Just a thought, but such a system could have avoided such a tragically
simple, and destructive method of attack.

Stephen

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