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Now if only I can buy an AJL hard case. I think he does not sell them except with a guitar.
I bought one of these but unfortunately it does not fit my Busato sized guitar. I can put the guitar in but the lid won't close. https://www.guitarcenter.com/WolfPak/Acoustic-Guitar-Polyfoam-Case.gc
No gig bag is going to protect against crushing, which is a serious possibility in any baggage-handling situation. That's why my favored not-a-Calton solution is a polyfoam case with some rigid component, preferably the top/bottom panels. The (no-longer-produced) SuperCase is the best I've come across, with the Travelite line a decent alternative.
I don't know about other foam-case designs, but what I look for is a snug fit (though a bit of slop is OK and I don't want the lid pushing down on the top), enough foam to resist impact damage (that is, a long drop), and enough rigidity (top/back/sides) to resist crushing. Of course, if a baggage truck runs over it, nothing short of a Calton or Hoffee is going to stand a chance. Which is why I never want my guitar going through the regular baggage system--gate-checked bags are hand-loaded and available on the jetway.
As Scott mentioned, make sure you board early. If you're on the plane early, you would have to be very unlucky to have any trouble. Every time I flew from Chicago to DiJ, I'd board early (on Southwest), go to the back of the plane, put my guitar in the overhead and put a jacket on the top and bunch it up. There's a chance someone else going to DiJ is on the same flight so you use the same overhead for both guitars, happened to me.