There's a small error on the Research Route page.
The list boxes ask you to choose the departing and arriving continents and airports, but when the result is displayed, the selections are inverted. i.e. The departure airport is listed as the arrival airport and vice-versa.
It doesn't really affect gameplay ... but it does distract the eye, especially when the rest of the game is so well planned and developed.
Kudos on the rest of the stuff though!
