Read your own previous posts on this thread.
Shockingly, it seems even “you” also already knew civilian airplanes could be used as a weapon!
So your point is ...what?
My point is that, as far as I’ve been able to tell, absolutely nobody published a warning prior to 9/11 that airliners could be hijacked and flown into buildings as missiles. So, IMHO, attempts to claim that this was readily foreseeable are just not true. Nobody saw it coming, or at least nobody published such a warning.
Obviously this was our failure in imagination.
For those who are convinced that they personally saw it coming, I’d appreciate it if they would just use their great insight to publish the location and type of the next attack so we can head it off.