The Hijacking "Profile" on 9/11 [View All]

[spooked911]

MercutioATC wrote this regarding flight 93 being a suspected hijack at 9:16am:

"That's why DAL1989 was also a suspect aircraft. After the first two hijackings (and crashes) longe-range northeastern seaboard departures all became suspect because they would match the profile of the existing hijackings. There could have been hijackings from other departure points, but that would make all 4500 planes in the sky suspect. They narrowed it down, I assume, by range and departure point."
http://www.democraticunderground.com/discuss/duboard.php?az=show_mesg&forum=125&topic_id=53148&mesg_id=53518

Granted that it turned out correct that all four hijacked craft on 9/11 were long-range flights coming from the northeast, but I wonder how they knew this pattern after only two hijackings?

Wasn't it risky to make the assumption that only long-range flights coming from the northeast were hijacking suspects? Did they simply take a gamble on this? Or did someone in charge have some foreknowledge of where the flights came from?

What is particularly interesting is that this same logic seemed to have been used (apparently) by Bush's Secret Service detail: they didn't seem to think he was at risk from the hijacked flights in Florida. Did they have some extra (fore?) knowledge of where the hijacked flights came from?