I traveled to Vegas alone with my 3 month old and took cloth diapers. even on the plane.
I took what I was comfortable with, because that is what ends up being the easiest.
Realize if you often have leaks with disposables is that what you want to deal with on the plane. If you choose to use disposables on the plane, maybe a good idea is to cover that with a cloth diaper cover.
We have 3 kids and have never taken disposables on vacation. Our view is well if we need disposables it is not like we will have any trouble finding them. We haven't had to use disposables yet.
Take them and try it. Oh and for space savings consider those space bags. If you suck all the air out of cloth diapers they can be sandwich trim like a disposable diaper.