Pre 9/11 all bets were off, i was at checkin, when the lady in front of me pulled out a pair of .45 Magnum from her handbag and put them on the checkin desk (concealed guns allowed in some us states). The whole room scattered.
In those days the flight captain had a box of passenger guns and ammo in the cockpit.
Who cared about Swiss Army knives, Atlanta airport sold full sets of cooks knives, upto Meat Cleaver size. They were allowed as hand luggage.