Civil Aviation Act Article 52
A civil air transport enterprise holding an air route certificate, or any aircraft stopping over in ROC territory shall be required to carry mail in accordance with the provisions of the ROC Postal Act.
中文原文 民用航空法第52條
已領有航線證書之民用航空運輸業，或經停中華民國境內之航空器，應依郵政法之規定，負責載運郵件。