The whole 'shoot down the hijacked airliner' idea it total BS. The idea that we would ever shoot down a 'plane load of innocent people because of what might happen is manifestly perverse and unethical.
Rubbish.
As far back as September 2001 the order was issued to USAF to shoot down any airliner that didn't respond to instructions, they would have done it then and they would do it today.