@Ansen-French Hope you're going to Venice Beach - I'd LOVE to ride my Onewheel on that boardwalk.
From what I've read on the forums, you have a 50/50 chance of getting your Onewheel on the plane, whether it's checked in or your carry-on, no matter which airline. It all depends on the mood of the TSA agent of airline employee you run into. Scary, right?
I just sold my Onewheel+ yesterday, and paid $59 to ship it from NC to MO via FedEx. If I had to travel with my Onewheel, I'd just ship it both directions. It'll cost over $100, but hey, the OneWheel is a non-necessity luxury item to begin with, and most people who own one probably have some disposable income ;)