Originally Posted by
notquiteaff
A lot of things in aviation are expensive
because we want aviation to be safe. Some of it may be safety or security theater. I don't claim to be an expert in airport and airline operations, so I don't know what is current standard or could be implemented. Any money spent on measures to prevent a reoccurrence of this scenario might also have a better use elsewhere (prevent other/more likely issues).
Don't think anyone here can really discuss this authoritatively 
All of us other than LarryJ are presumably sitting in our armchair.
Does being an aerospace engineer, being trained to do (and having deployed overseas to do) aircraft incident investigations, and having been a USAF Flight Test Engineer for the past four years give me a little bit of authority beyond "sitting in an armchair" when it comes to understanding aircraft design, operations, and incident investigation?