I spent the week of the terrorism deep in the Grand Canyon. When we got out on the Sunday afterwards we heard all sorts of different warnings about traveling with knives. I collected them from our backpacking group (2- fixed blades 6"+, 8 - folders 2" - 4"+, 6 jacknives, 4 - leathermen, 6 pair of scissors, and a few clippers) and was prepared to mail them home. However, I checked with the airline personnel and they said no problem if checked in my baggage. Still a little unsure, when I got to the counter I explained that I had about 30 knives and other sharp instruments from a group backpacking trip. He said no problem and told me to go and place my lock on the duffle bag. We flew into Logan A/P in Boston with no problems. I have since flown and have declared that I have a knife in my baggage and they all say, thanks and fine.
PS: I don't take it out of my baggage until I'm out of the A/P... just in case someone got the wrong idea.