I lost one version of this reply once already so I wrote the above and now I'll paste this one in; I hope it works this time:
Rule one – the law/TSA rules/airline rules require a hard sided, lockable case.
Rule two – the airlines do NOT always understand rule one. Okay, sometimes it's the personnel, not the airline itself.
Because I lost the original message I will omit the remarks about long guns and cowboy action, etc., but if you want me to flesh this out I will. I have done this many times. Sticking to handguns, then, let me give you some examples of hard sided, locking cases in which you can check a handgun on a plane:
Pelican Case 1170. | Nalpak
Personal Pistol Case - 501 - Pistol Cases and Camera Cases
https://www.google.com/search?q=tuf...%2F%2Fwww.tank007.net%2Ftuffcase.html;800;600
Victorinox Travel Gear - Hardside Luggage - Spectra? 2.0 26
CARRY-ON EXP. SPINNER TROLLEY Delsey 00207180004
Plano Gun Guard All Weather Large Pistol Case 17.25
https://www.google.com/search?q=bea...%26For%252520Gun%252520Type%3DHandgun;225;225
Hardside Luggage: Hardside Suitcases & Hard Case Baggag
http://thumbs1.ebaystatic.com/d/l225/m/mbG5QqPvLw32ihLmoDKWGIQ.jpg
There are many, many more examples of hard sided luggage/gun cases that will be suitable for carrying a checked handgun inside. Old time luggage and modern. Remember: HARD SIDED. LOCKABLE. That's the rule. So, here is one airline's interpretation of that rule:
Firearms & Ammunition
Everything you need to know is contained therein, in very plain English. Easy deal. However, because I KNOW that airline personnel don't always get it, let's look at the pertinent section:
Firearms must be packed in a hard-sided, locked container (or suitcase) or a hard-sided, locked gun case. A locked container is defined as one that completely secures the firearm from access by anyone other than you. Cases that can be pulled open with little effort do not meet this criterion.
Any clue what that means? Notice this special phrase:
hard-sided, locked container (or suitcase) or a hard-sided, locked gun case
. Followed by this special phrase:
A locked container is defined as one that completely secures the firearm from access by anyone other than you.
So, some people read that as meaning that you can use one of these inside a standard piece of soft luggage:
MTM Pistol Case 12 Black
It's hard sided, it has a place for small padlocks, so it totally fits into the definition. You would NEVER, repeat, NEVER be permitted to check one of those with your gun inside. But people do use them inside soft luggage and I know of airlines that have allowed it. When I was told, pardon the pun, I went ballistic. That is NOT what the rule requires. But since it falls into the definition airline personnel will allow it sometimes. Here's where it gets interesting, however – if you take one of these:
http://thumbs1.ebaystatic.com/d/l225/m/mbG5QqPvLw32ihLmoDKWGIQ.jpg
and toss your handgun into a side pocket, say in a gun sock or even loose, but you lock the case, airline personnel will claim you're not within the rule because your gun is loose. They shouldn't make that claim but they might – because I've had it happen. It's ignorant – but they do not understand. The hard sided, lockable case is the entire piece of luggage – as clearly explained by Frontier Airlines' nice long discussion. I've had TSA walk over and say it's good to go. I've had management have to tell the folks at the counter that it's good to go. But the folks behind the counter might not get it. So, basic rule – in large luggage, don't let your gun lie in there in a pocket just loose. Use a Midway-type case inside the luggage to avoid idiots who do not get it from ruining your travel day.