I fly with my flintlock pistols and blunderbuss to festivals all over the place with little more than a minor inconvenience. What they require is that you have your weapons in lock able gun cases. You will be asked to open that case for inspection right there at the ticket counter, then lock it again and they will tag it and take it away with the rest of your luggage, more than likely sending it through the x-ray machine like all other luggage. Of course you cannot take black powder in any manner on board, I usually ask someone at the festival sight to get me some there so I will have it and leave the left over with them. Another thing I do is thoroughly wash any clothing I had on when I was firing my weapons or that may have been in close contact with my guns or powder horn, flasks, anything. I also rinse and dry the powder horn/flask. The powder residue will set off the detectors and an embarrassing experience at the air port will surely follow. You will of course have carefully cleanded your guns before you pack them away so this should not be a problem for you. Another thing we learned at the air port is that the Never Dull we use to shine our brass will set off the detectors big time! Man did they go nuts when that detector went off!