Let the kids know what to expect during the flight. A clingy toddler might like to know that even though his bag is going in the overhead bin, it doesn't mean the plane is taking his favorite teddy bear inside. Make sure older children understand that their game systems must remain off until after takeoff.
Make a trip to your local dollar or discount store for new toys, activity books, craft supplies and books. You'll want to keep messes to a minimum on the plane, so stay away from markers and glue and opt for pipe cleaners and crayons. Look for books with interactive qualities, such as pop-ups, for younger kids.
Don't forget the portable DVD player and game system, along with extra batteries. If you can afford a new DVD or game, buy it. If not, you can check out some new ones from the library - just mind your due dates.
Give kids new toys and activities one by one during the flight. Just as they tire of one activity, you should have another surprise ready and waiting. If you hand everything over at once, your child's interest in each item will be shorter.
Try some art. Art projects are great for passing the time on a flight, but they do require adult supervision to prevent messes.
Break out the snacks. Between unappetizing plane food and disrupted schedules, kids can get cranky simply because they are hungry. Give them some healthy snacks to keep their tummies from rumbling.