I'm not sure either about heights and altitude being the same. I can't look over the side of a cliff of look down from a balcony of a tall building, even going up a few steps on a ladder scares thye s..t out of me butlooking out of the window of an airplane is no problem, BUT looking of of the open door of one IS a problem, still I must do it again without a doubt. Bungee jumping!I don't think so..... that a different ball game altogether, thou you never know.