AQ next attack will be more impressive from their viewpoint, especially on US soil, and may incorporate something they never did previously. What type weapons were not involved this time that could be involved in the next attack to escalate and kill more people, especially American people, for that is the only thing they strive to do again and the question we have to be prepared for.
With all these ship hijackings going on I would definitely bring down Frederick Foryth’s “The Devil’s Alternative” from the book shelf and re-read it.