I would strongly recommend the Pelican as well...A few years ago, while passing through Cabelas, I found a nice aluminum case on sale and still have it...
The down side is that is has no wheels and no carry strap...load it with a couple of guns, or one and cleaning supplies/ammo and it's almost too heavy to carry any distance... It does protect the firearms though,,,It's been on the bottom of the pile when a bunch of us go Prairie Dog shooting...
There have been a few instances of gun cases and contents come up missing from flights going through Chicago's O'hare...as well as others, I suppose...If I were dealing with firearms of that value, I'd be more inclined to UPS them to my destination than stick them in the baggage system...If they go out the day before your flight, you should arrive about the same time...
If you lived closer, I'd offer to throw them in with mine, as I'm driving....I really don't trust airline baggage personnel...