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Initially all the airport tiles have to have two colors.
When it comes time to put another tile down, does this new one also need to be two colored?
"No new tiles are drawn for the airports as long as there is still at least one remaining tile. Only after the last tile of an airport location has been taken, one new tile is drawn for the airport."
When there are no more tiles on an airport space, the new tile is drawn from the bag. Therfor randomly, so that it can have one or two colors.