Either Contracting Party may at any time request consultation with the other Contracting Party for the purpose of amending the present Agreement, such consultation to begin within a period of sixty days from the date of request. If the amendment relates only to the Schedule, the consultation shall be between the aeronautical authorities of both Contracting Parties. When these authorities agree on a new or revised Schedule, their recommendations on the matter will come into effect after they have been confirmed by an exchange of diplomatic notes.