You know... In "defense" of mehmetin, I have to point out an observation of mine: I see a lot of people here who seem to be confused about his "succession" argument; they're arguing the single point about the timing of the hijackings, but I'm not sure that's the whole argument.
I think mehmetin's argument is not simply that the planes were hijacked in succession, but that everything else also happened in succession; the first plane to take off was the first plane to be hijacked was the first plane to crash, the second plane to take off was the second plane to be hijacked was the second plane to crash, etc.
The only part of that which is even remotely interesting is the last leg; hijacking to crash. The major factor being the distance between the point of hijacking and the target. Even then, the succession of the crashes can be reasonably explained by the succession of the hijackings, which is itself adequately explained by the succession of the take-offs and is not much of an issue at all.
So, even though I think his entire argument still amounts to nothing, it looks to me as if more than few of his opposition are ignoring parts of it. It seems that mehmetin himself hasn't even caught on to that. Oh well...