Regulations of Civil Air Transport Enterprise Article 28

A civil air transport enterprise shall keep the following documents or electronic files used for its transportation at least two years from the date of take-off for CAA’S inspection:1) passenger ticket stubs.2) passenger manifests.3) air waybill, air consignment note, cargo manifest and related shipping documents.4) charter flight contract.
中文原文 民用航空運輸業管理規則第28條
民用航空運輸業對其運輸中使用之下列文件或其電子檔,應自起飛之日起至少保存二年,以備民航局查核:
一、乘客機票票根。
二、乘客艙單。
三、貨物提單、託運單、貨物艙單及有關運務文件。
四、包機合約。

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