Here's a twist. I do a bit of offshore racing and have found that there seems to be a correlation between crew who are regularly seasick and crew who admit to suffering a little vertigo. I was thinking it was an inner ear thing.
In any case it would seem odd to have a link between vertigo, sea sickness and pilots without having a link to air sickness. Now that would be weird, but maybe there are more than one type of motion sickness.