My husband and I just got our Sport Pilot licenses! So now we can talk about going out for the "hundred-dollar cache"! As for geocaches near airports, the only one I've seen so far was on an abandoned airfield.
However, I am thinking of asking permission to put one on the other side of the street from our local airport, perhaps with the stipulation that it be visited during daylight hours only. We'll see what happens!
Jodie
P.S. Is this the only post relating to geocaching aviators? Are there really that few of us?