I asked if you were travelling on your own because of the car seat. I don't think I would take the car seat if I had to do it again on my own because it would of been impossible to carry that, plus the carry on bag plus DS. It is handy though to give you a break. You can just strap her in and she can't run around. Will she watch TV? Call and make sure you have a screen on the seat she will be sitting in. They have kids movies and shows that she can tune in to. DS doesnt leave the headphones on so he can't hear it but he is more impressed with the bright pictures. I also took panadol on for them. The dr said to do this in case the pressure started hurting their ears. I didn't use it on the way back but DS was really fussy on the way over, crying a lot which is not like him so I gave him some panadol and he went to sleep not long after. I don't know if it was the pressure or not though. Another thing I did was on landing to get him to stay strapped in and calm I gave him a pen and a piece of paper and he scribbled on it for the whole landing. Just have to make sure she doesnt put the pen in her mouth. If you are on an international flight, which I am guessing you will be on have all your embarkment, disembarkment cards filled out straight after you check in as well as the landing cards for the particular country. You might not even get a spare minute on the plane to do it and if you do it as soon as you check, you will be more relaxed and then you can get straight of the plane and go through immigration without rushing to fill in forms.