Pre 9-11 I routinely carried multitools and folding pocket knives without any raised eyebrows. Now, I make sure that they have no reason to question my carryon. Two post 9-11 flights with my emergency "home away from home bag" received a close look see by the security. I had removed the "objectionble items" the night before and used the added space to carry a small rain poncho, added food snacks. My companions asked the standard questions regarding why several flashlights etc. The security was more concerned with the high heeled boots worn by a 55 year old lady in my group.

In the early 80's I was asked to remove my 3.5" single blade folder when taking my family to the annual county fair. The knife was in a leather case on my belt, both the knife and the case were rather plain (Sears Roebuck). They were accomodating about it. I let them hold it and they issued a receipt, it was politely returned when I left. Sadly, this has become more the norm now, rather than the exception when wearing a belt mounted case and knife. While I was a bit irritated, I let it go as I was still carrying my SAK in a pocket.

Times have changed.