I'm terrified of bridges/ balconies/ windows that go all the way to ground on floors 2+ (but not height though). I don't know why, but I am terrified if we have to drive (or walking is even worse) over a bridge and won't stand anywhere near the edge if I am not on the first floor. I won't even walk over those little bridges in the mall on the second floor to get to the other side, I have to walk all the way to the end, so I can stay by the wall. I'm a pilot too and have no problem in a plane at all. I even loved doing stalls.