After releasing 2 full expansions every year since the launch of Cities: Skylines, expansions seemed to dry up after 2020. Sunset Harbor released in March of 2020, and there hasn't been any full expansion since then. I'm not sure if this is the result of Colossal Order shutting down its studio temporarily during the COVID-19 pandemic, or if they have just been busy working on a sequel. I had assumed that Cities: Skylines was done, and that Sunset Harbor would be the final expansion for the game. But that is not the case, as a new expansion was finally released at the end of January 2022.
The Airports expansion is yet another expansion pack using the area-painting mechanic that was introduced in the Parklife expansion in 2018, then re-used in Industries and Campus in the subsequent years. As such, I don't know that I really have much to say about Airports. A lot of the same compliments and criticisms that were already applied to Parklife, Industries, and Campus also apply here.
Campus, ironically, did not teach Colossal Order any lessons
The modular nature of the airport buildings, taxi paths, and runways provides quite a bit of customization. There are 3 styles of airports: a retro-style, a modern style, and an "ultra-modern" style. They are functionally the same, so don't fill different roles the way that different parks, industries, or university types did in their respective expansions. The airports are massive and expensive, but they can be shaped to fit into irregular spaces in or around your city. Unfortunately, there's not nearly as much expressiveness as what we were offered by Parklife.
Airports come in different styles, and are customizable (parking lots and garage are mod assets).
Of course, Airports suffers from the same problems that have plagued the previous expansions that used the leveled-areas concept.
A lot of the modular components are simply decorative and have no function other than to increase the area's abstract "attractiveness". In the case of airports, these include the various hangars, parked planes, and so forth. Even the air traffic control tower is a purely decorative object, rather than being necessary for the airport to work!
I've also never liked how the park areas (and now the airport areas) level up by increasing the total visitors, and industries level up based on the total goods produced. This is something that is easy to achieve by simply waiting in-game months or years for the number to go up, regardless of the size or quality of the park, industry, or airport. Because of that, it can be easy for an airport to jump out ahead in total visitors, such that the area can be leveled up immediately, and at any time, by simply placing new structures that bring the attractiveness up above the required threshold.
Airports level up based on the total passengers, which can be easily increased by simply waiting.
Instead, I wish these areas would level up based on the weekly visitors (or good produced, for industries), rather than the cumulative total. This is a much better metric of the capacity of a park, industry, or airport. This is one of the things that the Campus expansion did a bit better than the others, since the universities level up based on the current number of students and the number of research projects. The amount of students is capped by the size of the school, and the research projects are semi-randomly created based on the funding levels and access to research facilities.
Airports aren't like that. Leveling them up feels much simpler and requires less effort and management from the player. Airports also cannot de-level (like universities could) if you fail to maintain its attractiveness, and since total passenger count is something that can never decrease the way that a university's student attendance can decline -- or the way that weekly passenger count could potentially decrease.
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