single trip 单程 round/return trip 往返 saver ticket 优惠票 airport tax 机场税 duty-free shop 免税店 vacant seat 空座 cabin 机舱 flight number 航班号 first class 头等仓 economy class 经济仓 business class 商务仓 pullman 卧铺车 E.T.D(estimated time of departure)预计起飞时间 E.T.A(estimated...