we will be taking our baby boy to Singapore this Wednesday. Very looking forward to this very first overseas trip for him. We have started our packing last night and we are bringing lots of stuff for him. Apart from eating, which I think you have the solution already (and I've also prepared the same thing for him...and will ask get congee for him when we have breakfast at the hotel), we also bring our own bed sheet, blanket to use to sleep at the play pan to sleep which we requested from hotel. And, we also bought hygiene tablet to clean his bottles. Because he's 9 month only, we still need to bring quite a few bottles with us. And one other reminder, we bought an inflatable pool (small size) to bring alone so as to treat it as a bath tab. As he's 9 month only, is dangerous to bath him in the big bath tab.
A lot to consider when bringing small baby to travel...oh! and bring lots of biscuit onboard in case he cries because of the turbulence or the air pressure.