Quoted:
The FAA said that the Plane hit the Penatgon had the Transponder turned off. (the identifier that planes have)
From the radar screens headed straight to the White House and then Turned to the right and at high speed dropped below radar and hit the pentagon.
They speculate that the terrorists must have had at least one trained flyboy.
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i wouldn't be surprised if every one of those planes had a terrorist "behind the wheel". after all, if it is muslim-related, martyrdom is the ultimate way to go. the highest rewards await thee.
i also heard (take with a grain of salt, flyboys, maybe you can confirm or deny this) that the 757s and 767s were almost identical in that if you could fly one, you could most definitely fly the other. makes it easier to train a pilot that way.
another point, the research and planning was really put into this: plane types, flight plans, targets, timing (rescue workers allowed to get in for higher casualty rates and media film already rolling for the second tower hit).
of course, it's only speculation as to why this was done, i think for some it would probably be enough for them to have said that they killed americans. regarless, this was some serious planning going on.
i'll be waiting to hear how much inkling we really had that something was up.