airplanen.飞机=aeroplane(英).
airlinern.定期班机;客机
airmailgram空邮代电
airmail pilot航邮飞机驾驶员
airmail stamp航空邮票
airmail packet航空小邮包
airmail lettern.航空信
airmail postage航空邮费
airmail express航空快信
airmail receipt空邮收据
"Letters to Europe from the U.S. are best airmailed"