
Nope, there is simply no evidence of a small plane, that's all
It's not a red herring at all if the question is "was there a large plane in the vicinity of the Pentagon at the time of the attack?"
I think the eyewitnesses definitively prove the answer is yes.
While I don't think they can be relied on to tell if it was a 757 or exactly what kind of large plane it was, I think they can accurately tell if it was in fact a large plane, and whether or not it looked like a commercial jet in general, with engines underneath the wings, as described by virtually all of them.

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