What I like best about this thread is shanek's insistence that the choice must be left up to the airlines. That way, if I want to fly on a gun-free plane I can choose to and if he wants to fly on a gun-full plane he can choose to.
This ignores a couple of key points. First, there is no way that an airline is going to allow gun on any of their flights. All it takes is one incident with a gun and the airline will be racked with lawsuits and its sales will fall like a plane with no wings.
Second, airline security is done for all airlines at one point. What is to stop someone from buying two plane tickets - one gunful and one gun free - and using the gun full ticket to get through security and then hijack the gun free plane? Or do we need to set up special areas in every airport just so that some people can carry their guns a plane?