Tablets for kids are great. On my last family trip back from Athens my 3-year-old sat quietly watching hers for the entire flight. Headphones on, of course.
What I don't get with some of these people is, how come they don't get annoyed by it? I don't want to listen to my kid's programmes any more than anyone else does. Apart from Hey Duggee maybe. I like Hey Duggee.