[jrewingjr]

They could crash it into something that is extremely dangerous if released, such as a nuclear facility, as mentioned above, or something else like a chemical plant.

We need to be thinking what these targets might be and keeping our eyes open. The public at large definitely tends to take things more at face value. If a Freeper sees a middle east looking type taking pictures of a chemical plant, we don't assume that Achmed is just a foreign student taking tourist pictures. I know that I would be making a citizen's arrest on his ass, and he better have more than a boxcutter.

[alethia]

I also think we need to be smart enough to realize that those who "have it in for us" may not be Middle Eastern types -- maybe not so easy to distinguish.

I agree that these planes and such could be crashed into something == particularly if explosives happen to have been brought onboard.