Submitting layouts to Robin Peel
Robin Peel manages the X-Plane airport database. You can email him new layout data. Some guidelines:
The sooner you submit your layout, the more likely it is that the airport area will be flattened in the global scenery.
If your layout is not done but you would still like it to be flattened, tell him you are submitting the layout only for global scenery creation - we'll use it to clear the DSF and you can finish the airport later.
If you need to submit a partially finished layout, make sure the airport boundary is correct and follows the rules of the apt.dat file format.