Regulations governing Foreign Aircrafts Flying in ROC Territory Article 9
Foreign aircraft operating in the ROC shall have its nationality mark and registration number clearly displayed on a conspicuous exterior part of the aircraft.
中文原文 外籍航空器飛航國境規則第9條
外籍航空器飛航國境時，應將國籍標誌及登記號碼標明於航空器上顯著之處。