I watched one of the 9-11 conspiracy videos today.  At least with the Pentagon crash and flight 93, they make a very good point:  the debris and targets in the crashes do not look the way they should.  

An extraordinary claim. So far I have seen no evidence beyond "it doesn't look the way it should and I know, I'm a mechanical engineer".

I don't claim any mechanical competence, but I call for evidence. Nothing more, nothing less.

Thus your comment is disingenuous. I did not move the goalposts.

In the long run, we're all dead. John Maynard Keynes