Okay, I touched base with my friend today. Also, as a caveat, I offer the following solely as someone who was in the environs of D.C. when this event happened. People here appear far better read on the matter than I. What I offer here is just personal memories. I could also e-mail certain long-ago friends in D.C. but you have to understand that if you were there that day, there is no doubt what happened, and to question it seems insane to those who were there.
First, what I recall: a big plane hit the Pentagon. There were pictures. I saw them. I saw video. The plane drove through the outer wall and penetrated the second ring - just the nose, I'm guessing. It was not 'vaporized'. It existed intact as a recognizeable plane (worse for wear, of course). There was no fire because very little fuel (I understand from my friend).
My friend was in Virginia that morning, but he had friends who actually experienced the plane going directly over their car - I hadn't known that at the time (the man who is local to me now who was in D.C. back then was my friend back then, too). I do recall all the interviews in the Washington Post - as I mentioned. I'd forgotten that he had friends who'd been on the 95 (I think) - pretty dramatic - unforgettable. There was a plane, folks, there was a plane. A big one. People saw it.
I taught a class that had parents in the government at various levels - and he reminded me that one of those parents was in the Pentagon that morning - and had a vivid story to tell of the plane sliding in - the sheer sound - the scale - unforgettable. (How could I have forgotten that? easy, I just don't think about 9/11 much at all - and a lot of living between then and now - better memories to store and recall).
Yet why go on? On some level, I sense that the witnessing doesn't matter - and could even be viewed as my being a government 'plant' to muddy the 'facts'.
I'm not. This was a real event - people lost their lives - some horrifically - in that plane. There are people who dies that day - they left families. What to say? There was a plane. Parse the 'facts' however you will - however the 'facts' seem to support alternative scenarios - the reality is there was a plane, people saw it, heard it, saw it lying in ruins. There wasn't a 'little hole' in a Pentagon wall - there was a devastation to the Pentagon building on one end. That's a fact. That's the way it was.