Oh, I am guessing this news report was read avidly by any number of people.
I think the biggest problem is payload. They can't lift much. But it wouldn't surprise me if the roads surrounding airports were much more subject to scrutiny. It wouldn't take much to get one into a landing plane's jet intake.
I was almost hesitant to write this in case someone read it and it gave them ideas (do terrorists use the Internet as an R&D lab?) but it is such an obvious terrorism application that surely counter terrorism experts have thought of it and put into place countermeasures.
