Since 2001 I have always used gun cases for my knives when flying, but I have not found the need for actually having any firearms in them, just the case is enough to warrant my own lock and special screening. Some airports will simply have you stand beside the X-ray with your key until they feel it is cleared, while some will ask for your keys to do a hands on screening and search within your sight and then return your key to you with a smile. The latter is no hassle and I invariably have a pleasant conversation about the cool knives I make and even hand out some cards.
At one time I used other hard cases, like for golf clubs or other sports equipment, but they didn’t attract the “special “ attention that you do in fact want. I once had over $10,000 in blades slung off the oversized conveyor and setting right next to the exit door for anybody to walk out with before I could get to baggage claim. A gun case (at least the rifle cases I use) end up under the scrutiny of security that require me to show my luggage ticket in order to claim it.
The gun case scenario is the only one that seems to offer no resistance to your own locks, the concept of TSA locks is absurd since it is the people who can freely open them that you are worried about! All that being said NY is not the place to mess around with trying to bring a gun along in your gun case, don’t ask me how I know this, but it does make for a very entertaining Ashokan story every year.
Whatever you do you want as much attention focused on your special cargo as possible. The base instinct to sneak the knives must be suppressed. You are not doing anything wrong by flying with knives in checked baggage but if you act sneaky or guilty, they will indeed find something wrong. Of course NEVER attempt to carry on any blades! Be up front about what you do with knives and most airport personnel will meet you with friendly interest, and the special attention will make it a bit harder for the less friendly personnel to make your property disappear. What do you think would be investigated more- a missing set of golf clubs or a stolen rifle case?
All that being said, once you are on the ground in NY keep that darned gun case out of sight. If you are asked about any weapons in a traffic stop immediately explain what you have and why, but if you are not asked about it don’t advertise a gun case… once again, don’t ask me why, unless you have half an hour around the fire at Ashokan

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