you'll do great. We went at 15m then 2.5, and both trips were amazing. Babies are easier than toddlers in some ways for sure. I think there is a pretty good twin thread on here you may want to search for. I'd link it but I am not that savvy. I loved watching the babies look at everything, they were totally mesmerized. At 9 months I would recommend having good baby carriers to wear along with your stroller. Or rent a stroller, that's what we always do, because it is such a pain to lug around. And just wear them in the airport (if you are flying). We traveled a LOT with our twins in infancy even though we didnt do Disney until a year old. But we went cross country several times, at 3m, 6m, etc etc. you are welcome to PM me if you have more specific concerns or questions about air travel, breast feeding, etc.