I figured that my tenor saxophone could be made to fit inside the case with room left over for some clothing. True, it would not be your standard saxophone flight case. It would be more of a special circumstance "checked baggage" dual purpose hard shell flight case.
My idea was to make a custom foam "cocoon" for the horn, place it in the suitcase, and have enough extra room for clothing. All of this had to be kept down to the airlines international checked baggage requirements for size (62 inches HxWxD) and just the right suitcase would make that possible. I knew that my local Goodwill would be the best place to find a cheap cadaver for my experiment. Goodwill had quite a selection.
I was surprised to find among the suitcases a hard shell tenor saxophone case!!!. It wasn't one of those high-end hard case. In fact, it was a low-end super un-protective hard case.