Beijing to Guangzhou is a daily airline of CAAC. 北京到广州是中国民航每天的定期航线。
Without that information, the airline was not able to determine whether crews had exceeded the federal limit for flying hours, The Cincinnati Enquirer reported. 缺少了该系统，定期航线就无法判断机组是否已经超过了联邦飞行时区的界线。
