Originally Posted by mhgaffney
You need to go back and ask them again. A low speed impact might have been possible for an amateur.
But the impacts on 9/11 were at ~500 mph -- very high speed -- impossible for an amateur pilot.
Why do you say that?
I will ask them again next time I see them. One is out of town to Australia. The other might come in tomorrow and bring coffee. If so I shall report.