noun
Motion sickness specifically caused by flying in an airplane.
飛行機酔いがひどくて、何も食べられなかった。
I had such bad airsickness that I couldn't eat anything.
飛行機酔いを防ぐために、酔い止めの薬を飲んだ。
I took motion sickness medicine to prevent airsickness.
Compound of 飛行機 (hikōki, 'airplane') and 酔い (yoi, 'sickness, intoxication').