Choose not to be miserable and it will make all the difference.
I used to be a stressed out traveler; but after one miserable (worst case scenario, overnight with baby and toddler in airport type thing) trip, i reailzed the kids do what i do. So now i make the trip the best part of the day. Get new toys, apps and snack. Put on your happiest face and keep it on - no. matter. what. Take whatever help anyone offers (including from that old lady who wants to talk to the toddler about her crazy cats

and try to go with the flow
good luck!