Artikel 18

1. Each designated airline may on any or all flights on the agreed routes and at its option, change aircraft in the territory of the other Contracting Party or at any point along the specified routes, provided that:
a) aircraft used beyond the point of change of aircraft shall be scheduled in coincidence with the inbound or outbound aircraft, as the case may be; and
b) in the case of a change of aircraft in the territory of the other Contracting Party and where more than one aircraft is operated beyond the point of change, not more than one such aircraft may be of equal size and none may be larger than the aircraft used on the third and fourth freedom sector.
2. For the purpose of change of gauge operations, a designated airline may use its own equipment and, subject to national regulations, leased equipment, and may operate under commercial arrangements with another airline.
3. A designated airline shall use identical flight numbers for the sectors of its change of aircraft operations.