The biggest thing I have found with airline hard cases is that the pressure needs a way to be released when you get them back. Aside from the monkey's throwing them this way and that in "handling" - just about any hardside case will do.
I have an aluminum one that was "rated for travel" that I had to purchase to send some weapons home that I inherited. It looks like I dragged it behind the truck for the 3,000 mile trip home. It's in such bad shape it can't be used again, so definitely go with plastic and something that locks.
I only buy Pelican cases, because of their guarantee, the lock and they have an air pressure release valve.
Try to open an air tight case that has been depressurized without a release valve. It's like trying to pry Jack off fresh tail after a LRRP in the jungle.