ARTICLE 15
1. This Convention shall be open for signature at Montreal on 23 September 1971, by States participating in the International Conference on Air Law held at Montreal from 8 to 23 September 1971 (hereinafter referred to as the Montreal Conference). After 10 October 1971, the Convention shall be open to all States for signature in Moscow, London and Washington. Any State which does not sign this Convention before its entry into force in accordance with paragraph 3 of this Article may accede to it at any time.
2. This Convention shall be subject to ratification by the signatory States. Instruments of ratification and instruments of accession shall be deposited with the Governments of the Union of Soviet Socialist Republics, the United Kingdom of Great Britain and Northern Ireland, and the United States of America, which are hereby designated the Depositary Governments.
3. This Convention shall enter into force thirty days following the date of the deposit of instruments of ratification by ten States signatory to this Convention which participated in the Montreal Conference.
4. For other States, this Convention shall enter into force on the date of entry into force of this Convention in accordance with paragraph 3 of this Article, or thirty days following the date of deposit of their instruments of ratification or accession, whichever is later.
5. The Depositary Governments shall promptly inform all signatory and acceding States of the date of each signature, the date of deposit of each instrument of ratification or accession, the date of entry into force of this Convention, and other notices.
6. As soon as this Convention comes into force, it shall be registered by the Depositary Governments pursuant to Article 102 of the Charter of the United Nations and pursuant to Article 83 of the Convention on International Civil Aviation (Chicago, 1944).