Regulations of Foreign Civil Air Transport Enterprise Article 2

A foreign civil air transport enterprise shall not solicit any passenger and/or cargo transport business in the ROC unless it has set up a branch office or entrusted a general sales agent in the ROC.
中文原文 外籍民用航空運輸業管理規則第2條
外籍民用航空運輸業應在中華民國境內設立分公司或委託在中華民國境內之總代理執行或處理客運或貨運業務,始得在中華民國境內攬載客貨。

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