Try to get an isle seat, makes it easier for getting in & out, also if bubs is a mover & wriggler it gives you more room. Fresh nappy before taking off & hope there is no number as the change tables in the toilets are so tiny & not much fun. I took toys that could be attached to my nappy bag, that way they didn't fall on the floor etc. Don't worry about noise, you need to be comfortable so do what ever you need. How is your DD in the car?? the motion usually puts them to sleep the same. I found each time I've flown Charlie has slept & we've flown 12 times in 16months!! Try for snacks that wont require too much stress or mess, biscuits, rusks etc. I always make sure I have what I need handy, dummy, special wrap etc & if DD is still able to be some sort of carrier I would use that also.