Next expansion to Cities: Skylines lands literally on console and PC on January 25th. The extension is called Airports and is exactly what it sounds like. Now it will be possible to connect your meticulously planned city with the rest of the world by building one or maybe more airports on the map.
You will be able to build modular aerodromes with the ability to place several different buildings and then connect them to a large airport. If you do well, your airport will be approved for passenger and / or freight traffic. At the same time, you get access to even more buildings to expand your creation. Also, do not forget to connect your city with public transport to facilitate transportation.