Civil Aviation Act Article 75

Civil air transport enterprise may apply for permission from MOTC via CAA to operate concurrently an airport ground handling service.The foregoing provision shall also apply to foreign civil air transport service, provided whose home country grants equal rights to ROC civil air transport enterprise to operate airport ground handling service in that country under a treaty or agreement, or based on an equal and reciprocal principle.To maintain airport security and good business order, MOTC may impose partial or complete restrictions on the operations of the approved airport ground handling service run concomitantly by a civil air transport enterprise, or an authorized private airport ground handling service.
中文原文 民用航空法第75條
民用航空運輸業得報請民航局核轉交通部許可後,兼營航空站地勤業或自辦航空站地勤業務。
前項規定,於依條約、協定或基於平等互惠原則,以同樣權利給與中華民國民用航空運輸業者在其國內經營航空站地勤業務之外籍民用航空運輸業,準用之。
前二項經許可兼營航空站地勤業或自辦航空站地勤業務者,交通部為維持航空站之安全及營運秩序,得限制其一部或全部之營業。

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