AT453 Cabin crew are required to carry out multiple searches of their aircraft prior to departure, whilst I am sure it is possibe to get a gun onboard an aircraft, I don't think it would be quite so easy.
And secondly to that AT453. Do you think telling the world on the internet how easy it could possible be to carry out such a barbaric attact, potentially killing hundreds of people, is such a wise thing to do? Please use your knogging!!!!!