She'll be 31 months when we go. I hadn't thought of the kicking the seat factor with using her regular booster, that is one more reason to try the CARES. I'm just not sure with no between the legs strap if it'll hold her still. We only have a 2.5 hour flight, though, so at least it isn't cross country or anything.
Rear facing is not an option for a couple of reasons. First, she hates it in the car partly because she can't see the screen for the VHS player, and we're bringing a portable DVD player for the girls on the plane so we'd have the same issue on the plane. And second, I'm not interested in buying a rear facing seat for what will most likely be one-time use, particularly since it is so hard to sell or give away a used seat these days with the safety recommendations against it. It isn't even a question of cost, it is just so wasteful that it isn't something I'd do.