Article 21
Report of registrations Each contracting State undertakes to supply to any other contracting State or to the International Civil Aviation Organization, on demand, information concerning the registration and ownership of any particular aircraft registered in that State. In addition, each contracting State shall furnish reports To the International Civil Aviation Organization, under such regulations as the latter may prescribe, giving such pertinent date as can be made available concerning the ownership and control of aircraft registered in that State and habitually engaged in international air navigation. The data thus obtained by the International Civil Aviation Organization shall be made available by it on request to the other contracting States.
CHAPTER IV
MEASURES TO FACILITATE AIR NAVIGATION
Article 22
Facilitation of formalities Each contracting State agrees to adopt all practicable measures, through the issuance of special regulations or otherwise, to facilitate and expedite navigation by aircraft between the territories of contracting States, and to prevent unnecessary delays to aircraft, crews, passengers and cargo, especially in the administration of the laws relating to immigration, quarantine, customs and clearance.
Article 23
Customs and immigration procedures
Each contracting State undertakes, so far as it may find practicable, to establish customs and