Organization Act of Airport under the Civil Aviation Administration of the MOTC Article 3

The airport offices under the CAA shall be classified into the following airport categories pursuant to the types of air routes serviced, volume of aircraft landing and take-off traffic, and volume of passenger and cargo planes: Airport S, Airport A, Airport B, Airport C, and Airport D. The establishment and category of a particular airport office shall be subject to CAA designation and thereafter forwarding to the Ministry of Transportation and Communications and the Executive Yuan for approval.The airport offices as stated in the preceding paragraph shall be named in locus or in memoriam.
中文原文 交通部民用航空局所屬航空站組織通則第3條
本局所屬航空站依航線種類、飛機起降架次、客貨運量等之多寡,分為特等航空站、甲等航空站、乙等航空站、丙等航空站、丁等航空站;其設立、等級,由本局報請交通部核轉行政院核定。
前項各航空站冠以所在地地名或紀念性專屬名稱。

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