Americase makes rugged gun cases in many configurations, even custom. My 3 gun Safari Case was apparently dropped on its end intentionally (baggage agent agreed with my assessment), with no damage to the guns and optics inside. The locks are integral, so no protrusions to hang up on the baggage "train". Ziegel Engineering makes both standard and custom cases from aluminum. Some with integral locks. Mine has logged over 100 flights with no damage to my guns. I also use Pelican, but mostly for Scuba equipment. They make a rugged case with a lifetime guarantee.