Hey Jean,
Take it with you on the plane if you can. I had an experience with an airline coming back from Augusta a few years ago. I was on my last leg of the trip in Cincinnati, Ohio. When I got ready to board the plane, the lady at the door told me I will have to check in one of my accordion as baggage. I had 2 of them, one in hardcase and another in a softbag that I purchased from Jr Martin store. It was the softbag one she wanted me to check in. So I gently protested and ask for a supervisor. The plane we were boarding was a smaller plane, thus smaller overhead bins. While we were waiting, she took another look at my softcase, and it was the kind that had side pockets on it. Well I had a couple of books in them for reading on the flight. She said if you take the books out is should fit. So I glady took them out and got my ass on the plane quickly. The case fit easily with no problem. So plane size is a thing to check. Make sure you know the measurements they allow carrying on items.
Later
Mark