I live in a bad neighborhood and, thus, carry a knife for self defense.

When I fly, I never check any baggage (not worth the hassle). I don't take my knife with me when I'm flying because I don't know what I can do with it. However, I've recently starting flying several times a month and I'm starting to feel like my personal safety is being threatened by my inability to take my knife.

What can I do? Do any airports have lockers or something similar?