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。
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，定期航線就無法判斷機組是否已經超過了聯邦飛行時區的界線。
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