There is ambiguity in distinguishing whether air passengers are following regulations or not due to the lack of clear operational definitions.The passenger's rights and interests are at risk when the pilot makes a wrong judgment and takes excessive measures.The unruly acts violate the code of conduct in accordance with public order and good morals,and the violation of aviation order must reach a serious degree or pose a threat to aviation safety.In cases involving the unruly acts,it is necessary to determine the causality between the act and the serious violation of aviation order or aviation safety accident.In cases of verbal or behavioral expressions,it is essential not only to establish the legal cau-sation between expressions and the potential for serious infringement on the aviation order or threats to aviation safety but also to establish the legal causality between the possible harmful acts and the serious violation of aviation order or aviation safety accidents.