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a). If either of the Contracting Parties considers it desirable to modify the terms of this Agreement, it may request consultation between the competent Aeronautical Authorities of the two Contracting Parties, and such consultation shall begin within a period of sixty days from the date of the request. When the aforesaid Authorities mutually agree to the modification of the present Agreement, such modifications shall come into force after they have been confirmed by an exchange of notes through diplomatic channels and shall forthwith be communicated to the Council of the International Civil Aviation Organization.
b). Changes in the order of points served on the specified air routes or omissions of any part of the specified air route, on any or all flights except the change of points served by the designated airline or airlines in the territory of the other Contracting Party, shall not be considered as modifications of this Agreement. The Aeronautical Authorities of either Contracting Party may, therefore, proceed unilaterally to make such changes or omissions provided, however, that notice of any change or omission shall be given without delay to the Aeronautical Authorities of the other Contracting Party.