I learned that at some airports locations, Southwest Airlines actually carries musical instruments out the plane and does not use the traditional luggage belt system to load the plane. This was explained to me by them. I am not sure they do this everywhere, but suggest you could ask ahead of time how they handle musical instruments as checked luggage.
That said, I have flown, with my Taylor a half dozen times and the case did it's job. though i admit, i did worry a bit each time...good luck!