[cardinal4]

because we were unaware that, when two planes are less than half a kilometre apart, they appear as a single blip on the radar screen.

WRONG. Each aircraft squawks a different code. They would not appear as one..

[Tallguy]

I don't think a tiny Predator drone could have taken down the WTC Tower(s). The structural analysts concluded that it was the massive fuel load that fed the fire that, in turn, created the structural failure. A Predator doesn't carry that kind of fuel load.

My mind is still open on the Shanksville crash. I think that the AF might have had a chance to react (slim) to that particular highjacking. It still doesn't make a difference as to who was responsible -- the Terrorists.