First of all..Good Luck. Now as for the other. Does he like to open presents. If so, wrap many small toys for him to open. Etch a sketch worked wonders for my daughters, and non sticky/juicy finger foods. I put them in individual zip bags. Now I would use the snack size glad-ware. I made a play tray out of a cookie sheet. It helped keep things from falling on the floor. Also, I had magnetic letters and shapes. You can also put magnets on pictures of his favorite people and the relatives he's going to see. Story telling about where he's going and who he's going to see will help the visit go smoother. We also booked the bulkhead seats. No seats in front to kick and more room to wiggle around without bothering people. The advice I give to all parents of children who are acting up is: Relax, those who have children will understand and those who don't never will. Benadryl works if they can take it. My Dr. prescribed Tylenol with Codeine. One or two doses will not cause problems. Have fun on your trip