If either of the Contracting Parties wishes to discuss with the other Contracting Party any matter relating to the present Agreement and/or its Annex, it may request consultation between the aeronautical authorities of the two Contracting Parties as specified in Article 1 para (a) of the present Agreement 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 and/or its Annex such modification shall come into effect when it has been confirmed by an exchange of Notes through the diplomatic channel which shall in the case of modification of the present Agreement state that the formalities required by the National Legislation of each Contracting Party have been accomplished.