Current UK firearms legislation would not allow it, so I'm intrigued to work out how Halfwit has a licence to carry a concealed handgun. That said, I have to agree that the problems of allowing any crew members to carry a gun are likely to be insurmountable, although small calibre/low velocity pistols are already carried by some sky marshalls. The debate about having the cockpit door locked/unlocked will, I'm sure, continue for quite a while......