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):

airsick
    adj 1: experiencing motion sickness [syn: airsick, air sick,
           carsick, seasick]

Moby Thesaurus II by Grady Ward, 1.0:

20 Moby Thesaurus words for "airsick":
   aerial, aerophysical, aerospace, aerotechnical, air-conscious,
   air-minded, air-wise, airworthy, aviational, barfy, carsick,
   nauseated, nauseous, pukish, puky, qualmish, qualmy, queasy,
   seasick, squeamish