Disagree, MtL. A flight attendant can go from the street to the cabin in 6 weeks and has full access to the flight deck and the bad guys know many airlines use the FA "guard" process. The same doesn't apply for a pilot. It would be too long a road to induct a "sleeper" pilot in hopes that they might be hired by a target airline and still be sympathetic to the cause years later. It is possible, and we've seen it on Egypt Air, where a pilot has "turned" within their career... most likely an insanity thing than a terrorist thing. I don't think a "guard" flight attendant would have prevented that one or could prevent any pilot from intentionally causing an aircraft to crash. We have also seen it on FedEx with a relatively new, deadheading Flight Engineer attacked the flight crew. I suppose any flight attendant could attempt to disable both crew members with the crash axe, but it would be a lot easier to just disable one when invited into the flight deck under SOP's. I don't see any advantages in using "guard" FA's, especially on aircraft with cockpit door cameras. I would like to read valid reasons for this process. Maybe I'm missing something. I'm always willing to learn. I'm not sure who has Reductio'd the most, but I would suggest that my position is more plausible than your extension.