The key is not to allow guns on the plane. Period. That does not however prevent commando types from snapping the odd neck or two. Nor does it do away with the hostage scenario. We are so accustomed to guns being the weapon of choice that we neglect the fear factor brought on by a few pounds of PBX, octal or C4 strapped to a person's body. Prevention beats a cure (which may decimate the patients).