[Peach]

Please let me know if you get an answer: I seem to recall it was less than 24 hours after the attacks.

[Tarheel]

Remember how quickly we saw the video tape at the airport that had Atta on it--how did they pull it that fast if they d/n know who they were looking for. It is not as though he had a sign around his neck that said --Look at Me , I'm Atta!

[TomGuy]

IIRC, it was within hours of the first attack at the WTC when some of the names of the hijackers started to emerge.

Probably, the live thread during that day might show the timeframe. [I don't have a link to that live thread and have no idea how to search back to find it.]

[mikegi]

Please let me know if you get an answer: I seem to recall it was less than 24 hours after the attacks.

The stewardesses on the flights gave the seat numbers of the hijackers to HQ. The hijackers used their real names for ticketing, etc. Many of them were already known by the CIA and other agencies.