Documentation guidance on polygon airport area sizes

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:

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.