Artikel 3

In order to prevent discriminatory practices and to assure equality of treatment, it is agreed that:
a. supplies of fuel, lubricating oils, spare parts, regular equipment and aircraft stores on board an aircraft of the designated airline of one Contracting Party on arrival in the territory of the other Contracting Party shall be exempt from all national duties and charges including customs duties and inspection fees even though such supplies are used by such aircraft on flights in that territory. The goods so exempted shall not be unloaded except with the approval of the customs authorities of the other Contracting Party, and if unloaded shall be kept under customs supervision until required for use of the aircraft in question or reexportation;
b. supplies of fuel, lubricating oils, spare parts, regular equipment and aircraft stores introduced into or taken on board aircraft of one Contracting Party in the territory of the second Contracting Party by or on behalf of the designated airline of the first Contracting Party and intended solely for use in the operation of an agreed service shall be exempt from all national duties and charges including customs duties and inspection fees imposed in the territory of the second Contracting Party, even though such supplies are used by such aircraft on flights in that territory. The goods so introduced shall be kept under customs supervision until required for the use in question or reexportation.