Documentation guidance on polygon airport area sizes

[N316TS]

Right now, the SDK documentation on polygon objects is missing some information on exactly what happens when you choose an airport size of XS versus S. Right now, it says this:

• Airport Area
  This option tells the simulation that the area is part of an airport. Selecting this option will affect how some of the buildings within the polygon are rendered in the world, and also open a further option to set the approximate size of the airport:
  
  The Airport Size Options For A Polygon Airport AreaThis option will affect the size and type of buildings that may be auto-generated in the area as well as certain airport models like ATC Towers.

But it does not tell you what the ramifications are of choosing “XS” or “XL”. I set an airport to “S” a few days ago and saw a bus driving around. Is ground traffic one of the things affected by that setting? At what threshold does a tower get generated? (And as an aside, should the AI system be looking here for whether or not to draw a tower, or should it be looking to see whether or not a tower frequency exists for the airport?)

So this idea is for an expansion of the documentation for more guidance on what option to choose when creating an airport or editing a World Hub airport.