I've always thought that AQ had no idea the towers would fall. Casualties would have been much lower if they had stood. I also believe that it's gotten harder for AQ to pull off a spectacular attack like 9-11. We know now that 9-11 was years (maybe a decade +) in planning. Since then they've been on the run and their money and other networks have been seriously damaged.
Backed up by the tape where Osama said he was the most-"optimistic" in thinking that the towers would snap off at the points of impact.
Any casualty figure updates?
AP still says 40, but surely that will increase here.