Funny thing is that I see the 757 far more clearly in the other camera's frame. In the frame you talk about, the only thing I clearly see is something that could be interpreted as the tail. If that is the tail, it's very clearly in view, but it's not clear at all that is the tail. If you follow me.
Again, I suggest downloading and watching Mike Wilson's SolidWorks
analysis. (I suspect the original from his web site is of better quality than the youtube.com
version. Also the downloadable version has many photos of aircraft wreckage at the end.) It shows very clearly how the security-video evidence is consistent with a 757. As a side note, I also noticed that Mike has posted a
video clip of himself being interviewed by CNN about his animation. In the clip he explains how the 757 appears to be too small because of the security camera's wide-angle lens.
[edit: I just noticed that I forgot to revise my comments about the pictures at the end of the utube version of the animation. I had originally linked to an
edited version that someone had posted, claiming it had been produced by
Eric Hufschmid!

I noticed the mistake when I was previewing and corrected the link, but neglected to correct my text.]