I'm afraid you really ARE quite naieve wrt this subject,
surely not - and why you persist in demonstrating that naievete time and time over, really had me wondering - until I read the little (envious) dig..."Gods of the skies"
The point re 'before 9/11' was to say that it was not in anyones belief that such an act could happen.
It might not have been in YOUR (naieve) belief, however in the late 1970's, a young British pilot by the name of Colin Foreman deliberately flew a Baron into the hangar of Connellan Airlines, in Australlia, killing a number of employees.
Prior to that, one must assume you had never heard of the Japanese
kamikaze pilots of WW2.
In late 1999, a young Japanese passenger forcibly entered the cockpit of an All Nippon aircraft, killed the Captain by stabbing him, and then threatened to fly the B747 into the Rainbow Bridge in Tokyo.
no-one would have believed such an act likely.
What you mean is, YOU were unaware of ALL of these, yet you doggedly persist in displaying this naievete in post after post here.
"
It is sometimes better to keep one's mouth shut, and APPEAR a fool, than to open it, and remove all doubt".