Pentagon Wants Kill Switch for Planes
The Pentagon's non-lethal weapons division is looking for technologies that could "disable" aircraft, before they can take off from a runway -- or block the planes from flying over a given city of stretch of land.
http://blog.wired.com/defense/2008/06/the-pentagons-n.html
Law of unintended consequences: "WHAT IS GOING TO BE DONE ABOUT ALL OF THESE PLANES CRASHING NEAR WASHINGTON??!!!!!" Why, make the kill zone 250 miles in diameter, of course.
To be fair, they want it for boats, too. "Oh, no! We're heading for the falls and the engine died because we got too close to the resort area!"