Less than one week before 9/11 several of the hijacker 'patsies', including Atta, boarded a Sun Cruz Casino Boat in Florida. Nobody knows why, and it has never been investigated.
The first plane to hit the WTC (North Tower) hit the computer room of Marsh & McClennan, which had recently acquired Kroll Associates, which was owned by son of AIG CEO Maurice Greenberg & Jules Kroll. Precision guidance equipment in office?