Incidentally, I can’t carry by gravity knife (which I always have with me) to the airport. So, for self-defense, I always have at least one Bic pen in my breast pocket. Should be enough said.
I used to carry a 3-3/8” Al-Mar lockblade through airports(including international ones), back when the rule was 3-1/2”. That being said, I’ve been feeling kinda’ frustrated lately, and would welcome a legally-permissible beatdown of somebody.
Get yourself one of these: