CIT has faced a lot of trouble because of the fly-over theory and the sometimes aggressive way in which Craig defended it. I wrote him that the missing of witnesses for a fly-over (only one, where there could be dozens) is the debunker's strongest point against him and that he should elaborate his argumentation in this regard.
He replied that he is working on it, but the project is quite comprising and may take some months to complete. To make sure you will not miss his reply, you might want to
subscribe to his News feed. As long as he will have no news, you will get no email from there.
In the meantime I suggest to respond to the objection that many people would have seen the fly-over with the question:
"You mean as many as there were cameras at the Pentagon?"
I am still not quite sure of the fly-over, but I am pretty sure that at least some of the 85 videos confiscated by the FBI - only minutes after the explosion -
did contain important evidence. (In the only published one, the most important frame is missing!)