A very interesting topic and discoveries in deed! Most of us outside US hope and pray that these type of measures to secure and protect the flight deck will work on the actual intent and purposes. Things always happen for a reason but after the last hijack attempt on Qantas, I believe ANYTHING can just happen at anywhere, anytime! It doesn't have to be due to long term political suppression, religion, insanity or even intoxication state....just pure anything! All the best to all the pilots with GUNS!