Regulations of Civil Air Transport Enterprise Article 26

When the nation is in urgent needs, civil air transport enterprise shall submit to the command of MOTC to handle assigned transport mission. The air route it normally serves may be suspended so as to fulfill national defense and military requirements.
中文原文 民用航空運輸業管理規則第26條
民用航空運輸業於國家緊急需要時,應接受交通部指揮,擔任交辦之運輸事項,其經營之航線,因國防及軍事上需要,亦得予以停航。

English translation for reference only; the Chinese text prevails. Not legal advice.