As CJ points out, this is a common question.
Just about anything goes for edged weapons in checked baggage. Firearms must be unloaded and declared, but edged weapons in checked baggage need no special treatment. You should please be very, very careful about packing fixed blade knives in soft-sided luggage. All we need is for someone's knife to get loose inside the bag, cut itself out and end up hanging outside the bag and slash one of the baggage handlers and they'll slap us with a long list of new rules.
Carry-on is a different matter. As shadowfax illustrates, there actually is no rule. The FAA has guidelines but the guard has total discretion. This is why one person will tell of having their Micra rejected while another will brag of boarding while wearing a broadsword. It's up to the guard to decide. Different guards will decide differently. The same guard may decide differently today than he did yesterday. The same guard may permit one passenger to pass with a CQC7 and reject another with a tiny SAK because "there was something about the second guy." And who's going to question him?
As I have often said, the best solution I've found is what I call the "Innocence by Association Method (tm) (patent pending)." If you dress like a gentleman, speak like a gentleman, and act like a gentleman, then any knife you might be carrying becomes just a harmless gentleman's pocket knife by definition.
Using the "Innocence by Association Method (tm) (patent pending)," I have successfully carried my AFCK through airport security openly (just placing it in the change tray) well over a hundred times at dozens of airports coast-to-coast.
Oh, and for those of you who don't know how, I will shortly be coming out with a video "Innocence by Association Method (tm) (patent pending)" which will explain how to dress, act, and speak like a gentleman.
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Chuck
Balisongs -- because it don't mean a thing if it ain't got that swing!
http://www.balisongcollector.com
[This message has been edited by Gollnick (edited 04-01-2001).]