Artikel 8

In operating any agreed service on any specified route a designated airline of one Contracting Party may substitute one aircraft for another at a point in the territory of the other Contracting Party only on the following conditions:
(a) that it is justified by reason of economy of operation;
(b) that the aircraft used on the section of the route more distant from the terminal in the territory of the first Contracting Party is not larger in capacity than that used in the nearer section;
(c) that the aircraft used on the more distant section shall operate only in connection with and as an extension of the service provided by the aircraft used on the nearer section and shall be scheduled so to do; the former shall arrive at the point of change for the purpose of carrying traffic transferred from, or to be transferred into, the aircraft used on the nearer section; and its capacity shall be determined with primary reference to this purpose;
(d) that there is an adequate volume of through traffic;
(e) that the airline shall not hold itself out to the public by advertisement or otherwise as providing a service which originates at the point where the change of aircraft is made;
(f) that the provisions of Article 7 of the present Agreement shall govern all arrangements made with regard to change of aircraft;
(g) that in connection with any one aircraft flight into the territory in which the change of aircraft is made, only one flight may be made out of that territory.