Those of you saying "he doesn't actually have planes" well no stuff. The symbolism of blowing up your loving school is more than ample grounds to assume you have something against it. Again, even if he was joking, the administration can't take chances like assuming that a possible terrorist suspect is just a prankster. Even if you think it's unfair, it's regulation. It's not unreasonable and everybody complaining clearly doesn't understand that in this situation one student being upset isn't more of a problem than multiple children wounded or killed.