[denydenydeny]

Atta was in Las Vegas on three different occasions last summer, with the apparent purpose of coordinating with the other pilots.

[fivecatsandadog]

Maybe, Las Vegas was the meeting site for creating their Master Plan or schedule of events, not just planning for the 9/11 attacks. They could have planned attacks up to a year or two in advance. Didn't the FBI find that 9/11 was in the works at least 2 years? Wasn't Atta later identified as the "ring-leader"? Someone replaced him and now coordinates all this activity. Seems like Las Vegas would be the perfect headquarters. Lots of tourists, easy to blend in.