All Functioning Airports/Airfields and Military Sites.
Any Airport with Gaelic in the offical name can be awnsered in Gaelic but must be the full name to give the extra challenge
I have fond memories of three of these. I did the World's shortest scheduled flight from Papa Westray to Westray (less than 2 minutes) and I watched planes land and take off at Barra - from the beach (which is the runway).
Slight typo in "awnsered" there, by the way.