Well, not trying to be negative here, but your airport is poorly set up :-/. You need to have definite areas for parking. Put in some aprons and concentrate the parking there, not in lots of random places. Once you do this, you can even have some wild designs that work.

The way I build an airport is I start with the main runway. Once that's in place, I put in some aprons where the parking with be. Then I add the parking spots and connect it all with taxiways (make sure you use all three kinds of taxiways - normal, runway, and apron). That should help the airport develop better.
Does that help?
- Kevin
