The arrival of Cities: Skylines' Airports DLC coincides with a nice update to the city builder's core game. The free update adds some AI tweaks and new customisation options that'll be welcome for all Cities: Skylines players, whether they've purchased the new DLC or not.
First up, airplane AI across the board has been updated, improving airplane behaviour in the base game. You should no longer see planes endlessly circling above your city, and they'll carry more passengers per trip. This applies to any mass transit vehicle that arrives from outside your city: you'll see less frequent trips, but with more passengers per trip.
Everyone will also see some new options for customisation. You'll be able to swap out the trees that line roads for the first time, simply by selecting a tree in the landscaping menu, and then clicking the segment of tree-lined road where you want to use that tree rather than the default. This way, you'll be able to change out the little maple trees with tall palms. Changing trees is always free, since the cost of trees is factored into the cost of the roads where they appear.
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