I always liked the idea that a citybuilder eventually comes to contain several other management games within it. Cities: Skylines takes another step in that direction with its next DLC, which will let you construct sprawling airports when it takes flight in January.
Here's the announcement trailer:
The DLC lets you construct modular airport buildings, clicking terminals together and connecting buildings via "concourse networks" according to the Paradox website. You set the ticket prices, and
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