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Almost always upgrade tower. You can add terminal capacity in other ways (Alien legacy, Space Travel Monument, Rocket Garden, Crop Circle, Luna Park) but towers are the only way to get more birds in the air.
I would upgrade the tower unless you feel you are limited by your passenger stores. The extra 150 passengers you could store is likely nothing compared to what your city can produce. Another hanger lets you fly another plane which leads to higher passenger outputs and faster game progress.
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