2988 Prevention of dis- crimination, etc. Post, p. 2991. Certificates of air- worthiness, etc. Post, p . 2991. Laws and regula- tions. INTERNATIONAL AGREEMENTS OTHER THAN TREATIES [61 STAT. (b) It is understood that either Contracting Party granted com- mercial rights under this Agreement should exercise them at the earliest practicable date except in the case of temporary inability to do so. ARTICLE 3 In order to prevent discriminatory practices and to assure equality of treatment, both Contracting Parties agree that: (a) Each of the Contracting Parties may impose or permit to be imposed just and reasonable charges for the use of public airports and other facilities under its control. Each of the Contracting Parties agrees, however, that these charges shall not be higher than would be paid for the use of such airports and facilities by its national air- craft engaged in similar international services. (b) Fuel, lubricating oils and spare parts introduced into the terri- tory of one Contracting Party by the other Contracting Party or its nationals, and intended solely for use by aircraft of such other Con- tracting Party shall be accorded national and most-favored-nation treatment with respect to the imposition of customs duties, inspection fees or other national duties or charges by the Contracting Party whose territory is entered. (c) The fuel, lubricating oils, spare parts, regular equipment and aircraft stores retained on board civil aircraft of the airlines of one Contracting Party authorized to operate the routes and services described in the Annex shall, upon arriving in or leaving the territory of the other Contracting Party, be exempt from customs, inspection fees or similar duties or charges, even though such supplies be used or consumed by such aircraft on flights in that territory. ARTICLE 4 Certificates of airworthiness, certificates of competency and licenses issued or rendered valid by one Contracting Party shall be recognized as valid by the other Contracting Party for the purpose of operating the routes and services described in the Annex. Each Contracting Party reserves the right, however, to refuse to recognize, for the pur- pose of flight above its own territory, certificates of competency and licenses granted to its own nationals by another state. ARTICLE 5 (a) The laws and regulations of one Contracting Party relating to the admission to or departure from its territory of aircraft engaged in
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