She uses a product called a reliefband... not sure how the heck it works (witchcraft?), but believe it or not it does the trick. Seems to keep her from getting sea sick as well. If you haven't tried one, I'd give it a go (can't hurt, right?). It gives a subtle electric stimulus to the wrist.
We've mainly been doing the $100 hamburger thing, but also have spent a fair amount of time using the plane for travel. I'm not IFR rated, so weather can be a pain, but I'm getting more confident while staying safe.
Most importantly, our little guy seems to like it. Maybe there's a chance of getting him hooked while he's really young?