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1). In a spirit of close cooperation the aeronautical authorities of both Contracting Parties shall consult each other from time to time with a view to ensuring the implementation of, and satisfactory compliance with, the provisions of this Agreement and the Schedule hereto and shall consult when necessary to provide for modification thereof.
2). Either Contracting Party may request consultations which may be oral or in writing and shall begin within a period of sixty (60) days of the date of the request unless both Contracting Parties agree to an extension of this period.
3). Any modification of this Agreement decided upon during the consultations referred to in paragraphs (1) and (2), shall be agreed upon in writing between the Contracting Parties and shall take effect on the date on which the Contracting Parties have informed each other in writing that the formalities constitutionally required therefor in their respective countries have been complied with.
4). The respective aeronautical authorities are entitled to agree in writing upon any modifications of the Schedule annexed to this Agreement decided upon during the consultations referred to in paragraphs (1) and (2). Such modifications shall take effect on a date to be determined in an exchange of diplomatic notes.