As a working muso the "sour grapes" comments from so many "travel pros" found in discussion forums is nothing new. And quite laughable since the PRIMARY reason a muso flies is to do gigs with their instrument.

Fortunately, the airlines (and congress) seem to "get it" and the issue isn't as bad as "Chicken Little's" like to make of it.

Having said that, I travel extensively with 45" x 20" x 7" cased acoustic guitar and IMO you would likely be okay. Better paid first or if you have some status with the airline since you would be able to board early and secure (hog) available bin space.

Small overheads? Once again, status and/or early boarding can help maybe secure a closet, etc. FA's tend to like us so pour on the charm and be as pleasant as possible. No need to get angry, ever! In the couple times I had no choice but to gate check the pilot/FO took a personal interest and insured it was handled with due care. Of course, a Grammy or two doesn't hurt, LOL....