Artikel 4

1. Each Contracting Party shall have the right to designate in writing to the other Contracting Party an airline or airlines for the purpose of operating the agreed services on the specified routes and to substitute another airline for an airline previously designated.
2. On receipt of such notification, the other Contracting Party shall, without delay, subject to the provisions of paragraphs 3 and 4 of this Article, grant to each designated airline the appropriate operating authorization.
3. The aeronautical authorities of a Contracting Party granting the operating authorization may require an airline designated by the other Contracting Party to satisfy them that it is qualified to fulfil the conditions prescribed under the laws and regulations normally and reasonably applied by such authorities to the operation of international air services.
4. Each Contracting Party shall have the right to refuse to grant the operating authorization referred to in paragraph 2 of this Article or to impose such conditions as it may deem necessary on the exercise by a designated airline of the rights specified in Article 3, in any case where the said Contracting Party is not satisfied that substantial ownership and effective control of that airline are vested in the Contracting Party designating the airline and/or in its nationals.
5. As soon as an airline has been designated and authorized, it may begin to operate the agreed new services for which it is designated provided that a tariff established in accordance with the provisions of Article 10 of this Agreement is in force in respect of that service.