61 STAT.] ECUADOR-AIR TRANSPORT SERVICES-JAN . 8 , 1947 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 aircraft engaged in similar international services. (b) Fuel, lubricating oils, and spare parts introduced into the territory of one contracting party by the other contracting party or its nationals, and intended solely for use by aircraft of the airlines of such contracting party shall, with respect to the imposition of customs duties, inspection fees or other national duties or charges by the contracting party whose territory is entered, be accorded the same treatment as that applying to national airlines and to airlines of the most-favored-nation. (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 and still in force 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 recog- nize, for the purpose of flight above its own territory, certificates of competency and licenses granted to its own nationals by the authorities of another state. ARTICI.L 5 (a) The laws and regulations of one contracting party relating to the admission to or departure from its territory of aircraft engaged in international air navigation, or to the operation and navigation of such aircraft while within its territory, shall be applied to the aircraft of airlines designated by the other contracting party, and shall be complied with by such aircraft upon entering or departing from or while within the territory of the first party. (b) The laws and regulations of one contracting party as to the admission to or departure from its territory of passengers, crew, or cargo of aircraft, such as regulations relating to entry, clearance, im- migration, passports, customs and quarantine shall be complied with by or on behalf of such passengers, crew or cargo of the airlines designated by the other contracting party upon entrance into or depar- ture from or while within the territory of the first party. ARTICLE 6 Each contracting party reserves the right to withhold or revoke the certificate or permit of an airline designated by the other contracting party in the event substantial ownership and effective control of such 2775 Post, p. 2778 Certificates of air- worthiness, etc. Poet, p. 2778 . I.nws andl rrg.il - tinges. Withholding or rev- ocation of certificate or permit.
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