Article 21

The Organization shall, at the request of the health administration concerned, arrange to certify, after any appropriate investigation, that a sanitary airport in its territory fulfils the conditions required by the Regulations.

The Organization shall, at the request of the health administration concerned, and after appropriate investigation, certify that a direct transit area at an airport in a yellow-fever infected area in its territory fulfils the conditions required by the Regulations.

These certifications shall be subject to periodic review by the Organization, in co-operation with the health administration concerned, to ensure that the required conditions are fulfilled.

In the list which the Organization is required to publish under Article 21, it shall indicate those airports certified under the provisions of this Article.