Airport effects on trade?

[Alinestra Covelia]

I'm making a modern day scenario, and I just happened to notice that putting an airport in cities altered their trade slightly. Does anybody know the specifics of this? No official documentation seems to comment on this.

Also, I've noticed that sometimes in a Communism certain cities experience corruption. How does this work?

[Shadowstrike]

The communism thing is due to a variable at the beginning of rules.txt. That specifies how far communist cities would have an effect of from the capital.

I don't know about the airport thing though...

[Frank Johnson]

I believe it is +50% to base bonus reveune and trade arrows if BOTH cities have airports.

[Alinestra Covelia]

AHA! That's it! The cities I was talking about had trade routes to others, and so presumably the airport just increased their trades.

Thanks - you've hit the nail on the head and I'm off to drink some tea.