Well, Im working on an airport right now an for the past half a year, and before that, I had built another airport, it was out of poportion, decor looked out of place, and things worked, but weren't right. So what I sugguest is get Mc-edit, and start building another, grander, better, more moder airport.

PS: in mine, I put drapes that span the concourse along the roof of the concourses (Concourses are where the gates are)