They could be thinking "Black Sunday".
The 1977 movie right? That's why I felt okay to post it. It's not like it's giving them an idea that is obvious to anyone. Even the teenager who flew his plane into the Tampa office building left in his suicide note that Bin Laden planned to attack the Superbowl. So if he hadn't already thought of it, well, then he did after that.
They're gonna hi-jack the Good Year blimb?
A "Black Sunday" scenario would be frightening.