Mitsurugi on 12 September 2011
To answer your question, its because those two cities are the biggest and most influential targets. Plus there's the shock value of hitting the White House or The Statue of Liberty. I don't think Al Qaida will ever pull off such a well organized attack so successfully again. But it would be just as damaging and frightening to the Nation's psyche if a lone wolf entered an elementary school and spread a cafeteria full of tots with bullets. With as little security as there is in most public schools it wouldn't be too difficult to accomplish.
