http://video.google.com/videoplay?docid=54...5301&q=pentagon If you stop that movie at 25 seconds you can find what looks to be a white thing on the right hand side right above the yellow thing. That right there in no way looks to be a 757. It is way to small plus you see no wings what so ever.
http://video.google.com/videoplay?docid=-1...6007&q=pentagonThat one if you stop it at 1 minute 25 seconds you will notice a tiny white thing on the right hand side. This also doesn't look like a 757. The nose is far to small. That movie is probley taken about 1000 feet away from the pentagon. from that far it would have looked a lot bigger.

This is what a 757 looks like from about 1000 feet away.
That is a tomahawk missle from about 1000 feet. So compare.
Hope this evidence is helpful.