Customs Modernization and Tariff Act
Section 1201. Ports Open to Vessels and Aircrafts Engaged in Foreign Trade. - Vessels and aircrafts engaged in foreign trade shall visit designated ports of entry only except as otherwise especially allowed by law: Provided, That no existing and valid government contract covering the handling of import and export cargo shall be diminished or impaired. Every vessel or aircraft arriving within a Customs District of the Philippines from a foreign port shall dock at the designated port of entry and shall be subject to the authority of the District Collector of the port while within its jurisdiction.