I really don't know. But it has some meaning.
I wouldn't look to a historical date
I don't think the fact has been sufficiently stressed
these people were practitioners of some occult rite
(not exactly a new thing in the history of Islam)
I wish I had listened to that Bin Laden tape more carefully
there were quite a few references to dreams,
it is clear that dreams play a great role in their 'strategy'.
And that weird last testimony of Atta,
(shaving the body, etc.)
is it available somewhere on the web??
Books 9 and 11 of the Koran
deal entirely with the punishment of the unbelievers.
Here are some samples.
At-Tauba (Book 9)
Then when the Sacred Months
(the Ist, 7th, 11th, and 12th months of the Islâmic calendar)
have passed,
then kill the Mushrikûn (unbelievers) wherever you find them,
and capture them and besiege them,
and prepare for them each and every ambush.
And the Jews say: 'Uzair (Ezra) is the son of Allâh,
and the Christians say: Messiah is the son of Allâh.
That is a saying from their mouths.
They imitate the saying of the disbelievers of old.
Allâh's Curse be on them,
how they are deluded away from the truth!
Hud (Book 11)
This book deals entirely with the destruction of the evil-doers,
the Flood, Sodom and Gomorrah, the Pharoh, etc.
Sample:
but those of the sects
(Jews, Christians and all the other non-Muslim nations)
that reject it (the Qur'ân),
the Fire will be their promised meeting-place.
A Final Comment:
Why was the date written 09-11-01 and not 09-11-2001??
Clearly because after the destruction of the unbelievers
(09-11)
follows the true word of Allah
(Chapter 1 of the Koran)