MOR is right,
i have to carry my bag with me, and THEN when i get to the aircraft i then put it in the hold myself, so with that case, i cant even get it to put in the hold!! the main point you are also missing is that i am already in the cockpit, so a weapon to gain access is futile, i am already in command! secondly, the 'weapons' i am talking about are not dangerous in any sense of the manor, there are far more dangerous things on the aircraft.