Hmmm, interesting. Nicolas said “all airports”. (I don’t want to reference his post again because he’ll get a notification from my link and this would be the third notification he’d be getting from me in 24 hours. Check out the second post in this thread.) He said “all airports,” but I assume he meant “all airports submitted through the World Hub.”
Most of the airports I’ve done are flat. So unfortunately, the only real data point I have is the one in the bug report I sent up.