In reply to pebbles:
I have a friend who is seriously claustrophobic to the extent he won't use the Tube unless he's had several pints first, and doesn't even like it when mainline trains go in tunnels. He doesn't have an issue with planes because he can see out, even small ones.
So as pebbles said, phobias tend not to be logical.
FWIW, though, I dislike heights at which I don't feel safe. So I'm happy in a plane (wasn't always, but that was a fear of crashing in a fireball, not a fear of height) and climbing with good anchors and a trusted belayer, but I don't like unroped exposure, e.g. I'm often the first to call for a rope on a scramble.
Neil
Post edited at 13:44