The Collaborative International Dictionary of English v.0.48:

Airsick \Air"sick`\, a.
   Affected with air sickness or a["e]rial sickness; feeling
   nauseous due to riding in an airplane. -- Air"sick`ness, n.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

airsickness
    n 1: motion sickness experienced while traveling by air
         (especially during turbulence) [syn: airsickness, air
         sickness]