Flying at 20 weeks

I'm getting ready to fly home for my sister's wedding tomorrow and feeling some anxiety about it. I know flying during pregnancy is perfectly safe at this stage but I've never been a good traveler to begin with. Any tips from anyone who has done it? I know that I need to stay hydrated and move around as much as possible. The flight is only 2.5 hours there and just under 3 on the way back.