Hoping for some helpful hints on ways to entertain a 16month old on plane trips?

We are heading to Asia in the next month or so and will be doing 6+ flights, longest being Syd - KL and Sing - Syd, and some shorter ones in between (1hr -3hrs).

Any helpful ideas. He's not walking, and don't think he will be then. (hyper mobility issues) Crawling up and down the aisles probably isn't a safe option

Thanks in advance!