That's Mountain Air. 2NCO
The runway is sloping, and the airport is pretty much on top, or on the side
of a mountain. The default FSX scenery is not very good because the runway is
flat. But I think one of the ad on packs has it with the sloping runway. There are real
world videos on utoob of pilots flying to and fro there. Nothing particularly hard about
flying there that I can see.. Scenery is better than usual though.