IF you want to focus on numbers, focus on religiously significant numbers to Islam. 1, 19, 40, and others.
See.. this is where I am always getting lost. I can't understand their calendar for the life of me.
It's possible I did not explain myself. I often fall into that trap.
I do believe that dates MAY be significant, but am not 100% sure. It depends on if you want to get into intricacies and if you want to believe that terrorists care what the date is on "our" calendar. 9/11 does look significant because it is our emergency code, but was it really and are we in the west focusing on it incorrectly? I don't think we can say 'for sure' that the attack was chosen for that date or if it was just the prime opportunity to hit us (when Allah was willing).
I focused on 1, 19, and 40 because they are directly from the Qur'an.
1, is obvious... in relations to the "One God," "the one."
19, 19 is the mystery number that I am not sure why no one focuses on more. We saw 19 hijackers on 9/11 (19 embedded in the number) and in many instances after that. There are NUMEROUS references to 19 in the Qur'an and it is believed to be part of a 'miracle code.' One interesting instance; The word 'One', in Arabic "Wahid," in reference to God, occurs 19 times
throughout the Quran.
Here is some info on the number 19, some interesting stuff if you are interested.
http://bahai-library.com/essays/nineteen.html
40, well, 40 is a significant number to all Abrahamic religions in some way. It goes back to the flood I believe.