When you pack for your next airplane trip it’s a good idea to quickly scan the TSA list of prohibited items. As a general rule you’ll want to pack things in your checked luggage rather than your carry-on because the rules are less restrictive.
I was very surprised how many things are allowed in checked baggage. Billy Clubs, Brass Knuckles, and Nanchukas are all OK !? Generally you’ll want to keep any flammable items at home.