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If either of the Contracting Parties wishes to discuss with the other Contracting Party any matter relating to the present Agreement, it may request consultation between the aeronautical authorities of the two Contracting Parties, and such consultation shall begin within sixty days of the date of receipt by the other Contracting Party of the request. If such consultation results in agreement between the said authorities on any modification to the terms of the present Agreement, such modification shall come into effect when it has been confirmed by an exchange of Notes through the diplomatic channel stating, moreover, that the formalities required by the National Legislation of each Contracting Party have been accomplished.