regular airline的用法和樣例：
例句
- Beijing to Guangzhou is a daily airline of CAAC.
北京到廣州是中國民航每天的定期航線(xiàn)。 - Without that information, the airline was not able to determine whether crews had exceeded the federal limit for flying hours, The Cincinnati Enquirer reported.
缺少了該系統，定期航線(xiàn)就無(wú)法判斷機組是否已經(jīng)超過(guò)了聯(lián)邦飛行時(shí)區的界線(xiàn)。
