One of the buildings looks a bit transparent and has an icon above it. What does that mean?

If the icon is that of a road that means you need to build a road to it.
If the icon is that of an exclamation point ("!") that means you need special materials to complete the construction (you can get them from flights, ask your friends for them or purchase with Airport Cash).
If the icon is that of a green lock that means the building is ready to operate, and you just need to tap it once to activate it.
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