On the San Diego Model Railroad Club's layout, I remember a scene, maybe not with an airport, but it had a plane flying out of the back drop, cut in two. I thought that would be a great idea for an airport if you had it against the backdrop.
Or a plane hanging from a very small thread(s).
I might be wrong, but I think blue lights would indicate a taxiway. Runways would be outlined in white lights.
Tom
Pittsburgh, PA