Yes it's not released for native Linux but many Linux players may want to play it, so this is how it can be done. Pretty well much the same way as for most other Window-only games on Steam Games.
There are ways to do this outside of Steam Games, but this method with ProtonDB in Steam Games is probably the easiest way.
Whilst we do have native Linux versions of X-Plane as well as FlightGear which are both very good, Microsoft's Flight Simulator has taken flight sims to a new level.
Microsoft Flight Simulator is an aircraft simulator video game for Xbox, as well as Microsoft Windows. It's one of the longest-running flying simulators