How to Prevent Motion Sickness When Flying

I sat in the back seat of a maroon 1986 Dodge Caravan, complete with the classic fake wood panels. It was a six-hour road trip from Ann Arbor to Louisville, and I found myself entertained by my Nintendo Gameboy. No, not the color one, the original black and white one. It took about an hour or so of Metroid until I looked up and projectile vomited into the unoccupied middle seats. Somewhere around Dayton, Ohio, in fact.