59 STAT.] PORTUGAL-AIR TRANSPORT-DEC. 6 , 1945 contracting party or to an airline of such other contracting party shall not be abrogated by the present agreement, except for any pro- visions included in the agreement conferring such operating rights which would prevent any airline designated under Article 2 above from operating under the present agreement. ARTICLE 4 In order to prevent discriminatory practices and to assure equality of treatment, it is agreed 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 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 such other contracting party shall be accorded national 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 terri- tory of the other contracting party, be exempt from customs, inspec- tion fees or similar duties or charges, even though such supplies be used or consumed by such aircraft on flights in that territory. ARTICLE 5 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 6 (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 the other contracting party, and shall be complied with by such aircraft upon entering or departing from or while within the territory of that party. (b) The laws and regulations of one contracting party as to the ad- mission to or departure from its territory of passengers, crew, or cargo 1847 Charges for use of facilities. Duties on fuel, lu- bricating oils and spare parts. Post, p. 1849. ltecognlllfn of va- ildity of(ortaln cer- tiflcates and licenscs. Post, p. 1849. Laws and regula- tions.
�
