If you plan to travel with firearms, please pay attention to this recent article from the NRA. It is important to follow the TSA rules, the airline rules for the particular airline on which you will be checking luggage, and also the suggestions in the article. Something I found interesting was the requirement to have a lock in every padlock hole as opposed to just a single lock. I checked on of my cases which has two locks on it and also found it had two padlock location so to fly with that case would require me to put two additional padlocks on the case. Not a big deal, but something which would certainly ruin your day if you showed up at the airport without the additional locks.