Some years ago there was a scenery exclude tool that interfaced with FS2004 to make excludes around airports. It was very easy to use and you merely went into slew mode and pinpointed the coordinates where you wanted to eliminate buildings and such.

Does anyone remember that tool?

Seems it was FSExc or Exc-something.

I had it installed on my WIN 7 machine, but missed transferring it over to the WIN 10 PC.

Seems like it was either by Lee Swordy or Martin Wright or one of the other scenery designers.