Planes, boats, busses, trains, cars, and rural sites can all massively benefit from a much bigger bandwidth pipe with low latency. Add in the US military which has already given spacex $28.7 million dollars to see if they can put it on all their vehicles (planes in particular for that award) and I think they have a decent sized market.

[0]: https://www.teslarati.com/spacex-starlink-us-military-500-70...