328 INTERNATIONAL AGREEMENTS OTHER THAN TREATIES so between certain points. Subject to the notification of any such requirements by one Party to the other Party, and to the right to prohibit air traffic over certain areas as stipulated in Article 6, the frontiers of the territories of the Parties to this arrangement may be crossed at any point. ARTICLE 16. As ballast, only fine sand or water may be dropped from an air- craft. ATICiL 17. No article or substance, other than ballast, may be unloaded or otherwise discharged in the course of flight unless special permis- sion for such purpose shall have been given by the authorities of the territory in which such unloading or discharge takes place. ARTICLE 18. Whenever questions of nationality arise in carrying out the pres- ent arrangement, it is agreed that every aircraft shall be deemed to possess the nationality of the Party in whose territory it is duly reg- istered. ARcTIC 19. The Parties to this arrangement shall communicate to each other the regulations relative to air traffic in force in their respective territories. ARTICLE 20. The present arrangement shall be subject to termination by either Party upon sixty days' notice given to the other Party or by the enactment by either Party of legislation inconsistent therewith. I am glad to assure Your Excellency that the foregoing text is the text which has been accepted by my Government in the course of the negotiations and is approved by them. In accordance with your suggestion, it is understood that the ar- rangement will come into force on the 4th day of December, 1937. Accept, Excellency, the renewed assurance of my highest con- sideration. EAMON DE VALERA Minister for External Affairs. His Excellency JOHN CUDAHY, Envoy Extraordinaryc&Minister Plenipotentiary of the United States of America, Dublin.
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