[dr_who]

The WTC was an excellent target because there was a clear flight path into it, there were enormous numbers of occupants in it, it was a landmark, and terrorists could learn from previous attempts how to successfully destroy the buildings. Intentional plane crashes into important buildings (and unintentional ones) are not unprecedented, and hijackings have been almost routine (you can take control of a plane armed with a knife?!!). Newsmen everywhere have been marvelling at how "sophisticated" that this attack was, but when you think more about it, the more stupid it seems and the more uncoordinated our government appears to be. The most amazing thing to me is that apparently not enough people understood that the buildings were in imminent danger of collapse.

[dr_who]

How far in advance are timetables given for these sorts of flights? When do flight planners produce them, and when are the plans released to the public? Anyone know?