"What has been concluded for the most part is this: Al Qaeda's thinking is that a second-wave attack should be more destructive and more disruptive than 9-11," Suskind told the magazine in an interview".
Is this really the answer to why it was called off?
It would have terrorized millions who use mass transit throughout all major cities for the long haul.
further down in the story, President Bush himself is reported to have wondered just why they called it off.
My guess is that our buildup in Iraq had AQ worried (this all occured at the same time that we were screwing around with the UN to get them to go into Iraq with us). I seem to remember that our danger alert level went right up around the time that Colin Powell went into the UN with his briefing, and the libs trashed President Bush and Homeland Security for playing games.....
Maybe they figured (and probably correctly) that we'd respond with a nuke in the case of a gas attack.