X-Plane 12
X-Plane 12 is the current generation simulator from Laminar Research. This simulator will run on Linux, as well as Mac and Windows.
Running X-Plane 12
This simulator should be able to run out of the box with minimal problems. There are two options when buying this simulator:
Installing Addons
Installing a lot of addons for X-Plane is quite simple as this game runs natively on Linux. A lot of the installation is the same as Windows.
Installing Windows only Addons
Previously on X-Plane 11, you could run the simulator through Wine/Proton which removed Vulkan support and forced the game to run in OpenGL. X-Plane 12 drops OpenGL and forces Vulkan, leading to an error when you try to start the simulator.