应急预案启动时机的选择是应急管理领域中应对危机时需要解决的关键问题。
In coping with crises, when to start an emergency preplan is a problem that calls for solution.
据此，民航局要求各航空公司密切关注天气情况，以便在发生大面积航班延误时及时启动应急预案。
It urged airline companies to pay close attention to the weather and improve contingency plans in case of flights delays.
玉树发生地震后，中国民航各单位在第一时间启动应急预案。
Shortly after the earthquake in Yushu, the Civil Aviation Administration of China (CAAC) and all the airlines, airports and related companies launched the contingency plan.
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