Airports should be as easy to build and access as train stations.

From the latest updates from the train, I feel that it can make the existing airport that in addition to sending goods. I want there to be a terminal to send passengers from our population to other cities or there is a delivery of goods, exchange of goods, there may be a flight, a lounge, something like this. The important thing is that I feel that the same airport is boring. I want to have an airport option and add space to expand the base to build buildings as needed. And this is what I suggest.