I have not felt airsick in years (even though I am prone to other motion sickness, such as seasickness). It seems that I fly so often I am used to it.

5 years ago, however, I had to fly in a big hurry from Iceland to Washington, D.C. All of the direct Keflavik - BWI flights were booked, so I flew Keflavik - London - JFK - BWI. The last segment was on a Dehavilland turboprop, in a winter storm. We took off behind a heavy jet, making for a rough takeoff, and then bucked and swayed all the way to BWI. A combination of extreme fatigue (I just finished working a stretch of 20+ 12 hour days) plus a bit of overindulging in Business Class on BA from London to JFK left me feeling quite ill. I didn't "lose it", but I was pale and perspiring heavily on the flight, and staggered off the plane once we landed.