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Thinking about it, and although I am not an experienced Pilot, this took some bearing to turn these planes and know where to go from their turning point back to their intended targets...Now I may be wrong, but if someone is not from and area, how is it they found their land marks, or, how was it they knew their compass headings?

With all involved in air traffic, a turn around cannot be rehersed very easily because these planes to my knowledge, do not always take the same exact path from point a to point be...point being, I think these "Terrorists" lived here for a while, and flew a plane around here for a while. If they never flew over the right coast, they are indeed good to navigate back a couple hundred miles and find their targets...very good indeed.

how is it they found their land marks, or, how was it they knew their compass headings?

GPS, Global Postioning System. Standard equipment on airliners. All one would need to know is LAT/LON of the Manhattan.