My sister is not particularly inclined to air travel—she regularly throws up, and the feeling of nausea is evident well before motion sickness could occur (i.e. inside the terminal).
I suspect some of it is due to a reverse-placebo psychological effect—she likely associated motion sickness with airports/airplanes/air travel at an early age and it's unfortunately carried through. It's probably not entirely the odor of burnt jet-fuel (although she does mention that as contributing) since she's fine when she's going to the airport to say bye to relatives.
Also of note—my sister is only 11 years old, so that limits what can be done to help her as far as medication is concerned.
Unfortunately, neither Dramamine, Benadryl, nor Sea-Bands have been of any help, as we discovered two days ago. We're going to consult her doctor when we get back to the US, but the slight problem with that is that there is a 12 hour plane ride back to the US, and the preferable option would be to go back with as little vomit as possible.
What could be done to help alleviate her nausea?