Just yesterday, I witnessed a passenger walk unsupervised down some stairs from a gate at Dublin and instead of making his way to the plane he was meant to, he walked across the apron and up some other set of stairs. This is how it happens ladies and gents. Airport staff not doing their job properly.
On this occasion though, come on...Russian and Israeli identities swiped through a database to see if he had any flight ticket booked only for none to be found....Those are obviously very good faked documents or legit fake identities....."By way of deception thou shalt make war."