I used to fly about three times a month. I remember when I used to go through airport security with a knife every time. Then 9/11 and I almost had my serrated edge knife confiscated due to serrated edge, but they relented and let me fly with it the last time. I gave that knife to a friend and got the same model knife with a plain edge. That worked for a while and then all knives were banned. Then I started carrying an Uzi tactical pen. Never got denied for that.