Try fun snacks, teddy grahams, fish crackers, animal cookies etc. Play and eat at the same time. Also eating helps with air presure changes hurting ears.Also take along a non-spill sip cup if he is off the bottle. They have to suck to get the juice and that will help with air presure changes too. Lets see; try puppets, a not too loud interactive electronic toy, color forms for the window, a favorite stuffed toy and a new wraped surprise or two. His best toy will be you. You might have to spend most of the time keeping him happy. Sing, tell him stories etc. Bring his car seat and favorite blanket and he might take a nap!!!
Have a great trip!
Jordan's mom