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Certificates of airworthiness, certificates of competency and licenses issued or rendered valid by one Contracting Party, and still in force, shall be recognized as valid by the other Contracting Party for the purpose of operating the routes and services provided for in this Agreement, provided that the requirements under which such certificates or licenses were issued or rendered valid are equal to or above the minimum standards which may be established pursuant to the Convention on international Civil Aviation. Each Contracting Party reserves the right, however, to refuse to recognize, for the purpose of flight above its own territory, certificates of competency and licenses granted to its own nationals by another State.