G Gothamloki All worlds 11 Apr 2012 17:49Link An airport simply means you have an Air Transport corp operating in your country.
L Laguna All worlds 12 Apr 2012 13:15Link If you try to send relief supplies to a country struck by a natural disaster, you can send these at a faster pace. That is the only change an airport brings, iirc.
T The Money Maker All worlds 14 Apr 2012 07:19Link but you can still send relief supplies even without it you just need trasports....