hi beck,
we went to m'sia so the time difference were 2 hrs and 3 hrs both times we went there.. so it wasnt so bad... it didnt make as much difference.. the first couple of nights he was a bit unsettled but after that he was ok. the first trip we made was a day flight, and we got to KL at night and he was just so unsettled, and didnt sleep all night. but then he was only 4 mths then..

sorry, am not much help..
only thing i can suggest if possible for them to sleep thru the flight.. very hard i know..
xoxox
hope all goes well, hun