hi hun, i flew with my dd from australia to the uk when she was younger. i took my formula dispenser with pre measured amounts of formula in them and when it was feed time i asked an attendant to pour some boiled water into a bottle which i then topped up with cold bottled water to get the temp right. maybe practice roughly how much boiled water u need at home beforehand. i also had extra formula in my carry on luggage incase she needed more. as for the timezones, she pretty much slept when she wanted but i found when all the lights were off and everything went quiet she relaxed and went to sleep. we didnt really have much trouble in settling her once we arrived. hope this helps and good luck xx