Comment by mikeash

I like the idea of an "at your own risk" option, but it'll never happen. Since 9/11, a large part of the purpose of airport security is to protect uninvolved people on the ground (or at least in tall buildings), not just passengers. We can certainly debate whether that's necessary or useful (I'd argue that we could do far less than we currently do), but I don't think you'll ever get the public to agree to allowing airline flights with no security screening, even if you can convince everyone to take a libertarian approach to it.