One way of making use of a seatbelt is by eating it. He tried. It was his first flight so who can blame him? At least he tried.
Otherwise he chatted away to himself, smiled while looking all around and fought sleep like a warrior. Happy in his nappy. It was six hours past his bedtime before he finally hit the hay, exhausted from all the excitement of being higher than he's ever been. I'm still not sure he's come down yet.