Just follow the rules for your particular airline and TSA.....they are all online. I have flown dozens of times with firearms on Alaska Airlines and have had zero issues. When I moved from AK to NM I transported all of my handguns in my checked baggage from Fairbanks to Albuquerque. I was allowed two bags that contained firearms, but they didn't care how many guns were in each bag....no one even blinked an eye at check-in. I locked 8 in a smaller bag which came out on the carousel like any other piece of luggage. In a Pelican rifle case I packed 21 handguns, and that was handed to me personally at the oversized baggage area in Albuquerque. There should be nothing on a normal piece of luggage that identifies it as having firearms inside and they should be as safe as any other piece of luggage....of course a rifle case may be kind of obvious.
