Date of the attack: 9/11 = 9 + 1 + 1 = 11.
September 11th is the 254th day of the year: 2 + 5 + 4 = 11.
After September 11th there are 111 days left to the end of the year.
Twin Towers - standing side by side, looks like the number 11.
The first plane to hit the towers was Flight 11.
State of New York - The 11th State added to the Union.
New York City - 11 Letters.
The Pentagon - 11 Letters.
Afghanistan - 11 Letters.
Ramzi Yousef - 11 Letters (convicted or orchestrating the attack on the WTC in 1993).
Flight 11 -> 92 on board - 9 + 2 = 11.
Flight 77 -> 65 on board - 6 + 5 = 11.
