I just don't understand all those who say, hey, listen to my DVD or hear my child scream. Like those are the only two choices, and they aren't. I've flown with plenty of parents who spend the entire time on the plane entertaining their children. Is it tiring for the parents? I'm sure it is. It always was when our grands were younger and we flew together. Yes, there are times when even that doesn't work, but then no one expects children to always be quite. Sometimes kids have meltdowns..vacations are tough for them.
When we were in Dublin last year, we noticed that on the train, there were signs saying, this is a quiet car...you must use headphones on all appliances. There was no if's or but's. Everyone on that car, children and adults had their ipods and DVD's, but with headphones. They were told they had to use the headphones in order to use their equipment, and so they did. This is children and adults. I'm betting if your child thinks the only way to listen to a DVD is with headphones, it won't be long until he'll wear headphones.