It is actually rather simple. Airports are extremely expensive of course, but if you build three airports you have three connections. Four airports give six. Five airports ten... Each of these connections require dedicated tracks if you want to go by train.
It is actually rather simple. Airports are extremely expensive of course, but if you build three airports you have three connections. Four airports give six. Five airports ten... Each of these connections require dedicated tracks if you want to go by train.