This question begs another: Why don't
default FS9 airports show up in the Nearest List? I've tried to figure this out the criteria used in generating this list ever since FS9 came out (July 30, 2003).
For a while, I thought is was if the DEST airport is entered into the GPS, it wouldn't show, but this is not the case. I've changed the DEST airport in the GPS and ones we're looking for still
doesn't show.
Here's an example flying into Spokane Intl., KGEG: we're within 12nm and it's not included in the list. There are other airports in FS9 that don't show up in the list either.

P.S. they don't show using Farther From YOu option either
Go figure!