I am 70 years old. I carry a cane with me where ever I go. I live near DC and have no problem carrying it there. TSA will not question me if I travel by plane. I made my own cane from a blank 36" piece of white oak with a crook at one end. It is about 11/8th in dia.I got it on a website that sells stockman's canes for use with livestock. I cost me $8.50 plus shipping. I copied one of the canes I saw on the "Cane masters" website plus I made some additional modifications. I sharpened the end of the crook, not to a needle point but good enough. I also mitered the inside shaft of the cane to 45degrees which gives me basically a cutting edge without appearing so. I have Michael Janics "Martial Cane Concepts" CD and practice several times a week. Whether I will ever have to use it for self defense is a question I do not want answered. But if push comes to shove at least I am not unarmed. I generally also carry a folding knife.
For those of you that travel a cane is an ideal addition to your self defense arsenal. I enjoyed making the cane so much that I am going to make another with additional modifications , perhaps some brass inlay on the crook to give it a little additional weight. I have some other ideas as well but I have to be careful that it doesn't appear to be a sword or a war hammer, I think it can be done however for the sake of decorative art.