Wino,
previous hijacks in the seventies were responded to by locking the cockpit door. Then terrorists then just kept putting bullets through the heads of cabin crew until the door was opened. Ask Lufthansa - they found out the hard way.
Locking the door is not going to do it.
As for high impact stunts - the same loss of life could be effected with a smaller aircraft into a football stadium stand any cup final day.
As for weapons - don't the airlines provide an adequate amount of good quality steel knives on board?
[ 15 September 2001: Message edited by: PPRuNe Towers ]