You could have that available on the inflight wifi would work fine, local image/tile server to a certain level globally, cache the area under the projected flightpath before departure, then update the cache as time goes on.

Some planes have external cameras too which can be interesting - you could have those on the inflight wifi too.

I’m sure that’s exactly the sort of complicated technology product that airlines would excel at delivering.

For the first part you can also just go on flightradar on your phone on the flight wifi.