As of a few days ago, SimAirport [Steam] is now officially supported on Linux. This modern tycoon-style sim allows you to design, build, and manage every aspect of an airport.
In August, the developer was looking for testers of a Linux version, so it's pleasing to know that went well for them.
Linux support arrived as of the October 3rd patch (notes here), which has both 32bit and 64bit versions available. The patch wasn't limited to adding Linux, it also added lots of new features as well as performance improvements. If you're interested in seeing what else they have planned, they have a roadmap here.
About the game:
SimAirport is a modern tycoon-style simulation & management game where you design, build, and manage an airport.
You will construct an airport from the ground up, hire your staff, choose airlines to work with, customize flight schedules, build out your infrastructure -- baggage conveyor systems & luggage services, roads, fuel pipelines, runway upgrades, navigation aids, hangars and service vehicles, etc -- and much more.
We've requested a review key, so hopefully we can take a good look in future.