Birth aboard aircraft and ships
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The subject of birth aboard aircraft and ships is one with a long history in public international law. The law on the subject is complex, because various states apply differing principles of nationality, namely jus soli and jus sanguinis, to varying degrees and with varying qualifications.
Prior to the 1961 Convention, quite a number of states expressly provided, in their laws, that births and deaths aboard an aircraft registered to that state are considered to have occurred on national territory, and thus the nationality laws of that territory apply. One such was § 32(5) of the British Nationality Act 1948.
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Under the 1944 Convention on International Civil Aviation, articles 17–21, all aircraft have the nationality of the state in which they are registered, and may not have multiple nationalities. The law of the aircraft's nationality is applicable on the aircraft. However, nationality laws of any country already apply everywhere, since it is for each country to determine who are its nationals. So this convention has no effect on nationality laws. The convention does not say that a birth on a country's aircraft is to be treated as a birth in that country for the purposes of nationality.
Under the 1961 Convention on the Reduction of Statelessness, for the purposes of determining the obligations under the Convention, a birth on a ship or aircraft in international waters or airspace shall be treated as a birth in the country of the ship or aircraft's registration. However, the Convention applies only to births where the child would otherwise be stateless. Since in most cases a child would be covered by one or more countries' jus sanguinis at birth (getting the same citizenship as its parents), this Convention rarely comes into play. In addition, there are still very few Member States that are party to the 1961 Convention.
There has however, been another methodology instituted followed by more countries, which dictates that the coordinates of the aircraft at the time of birth are taken into account when determining the child's nationality. There is some amount of argument over what to do when and if the child is born over international waters. The most accepted approach is to use either the depart or arrival destination, depending on which the coordinates are closer to.
U.S. law holds that natural persons born on foreign ships docked at U.S. ports or born within the limit of U.S. territorial waters are U.S. citizens. An important exception to this rule is that children born to people who (in line with the Fourteenth Amendment to the United States Constitution) are not "subject to the jurisdiction" of the United States (e.g., foreign diplomats accredited with the United States Department of State or invading foreign enemy forces) are not automatically U.S. citizens. Despite a common misconception to the contrary, birth on board a U.S.-flagged ship, airliner, or military vessel outside of the 12-nautical mile (22.2 km/ 13-13/16 st. mi.) limit is not considered to be a birth on U.S. territory, and the principle of jus soli thus does not apply.
In addition to the question of a child's citizenship, there is also a question of how to report "Place of Birth" for children born in transit. US State Department guidance instructs that a child born in international waters should have their place of birth listed as "AT SEA", while those born in the territorial waters of any country would list the name of that country. A child born in flight in a region where no country claims sovereignty would list their place of birth as "IN THE AIR".
- Barbara Reukema (1982). "Birth on board aircraft". Discriminatory Refusal of Carriage in North America. Kluwer Law and Taxation Publishers. pp. 117–124. ISBN 90-6544-049-6.
- William Samore (July 1951). "Statelessness as a Consequence of the Conflict of Nationality Laws". The American Journal of International Law. The American Journal of International Law, Vol. 45, No. 3. 45 (3): 476–494. JSTOR 2194545. doi:10.2307/2194545.
- Gerhard Von Glahn (1976). "The Law and the Individual". Law Among Nations: An Introduction to Public International Law. Macmillan. p. 202. ISBN 0-02-423150-9.
- Lauterpacht. "re Delgado de Román". International Law Reports. Cambridge University Press. pp. 371–372. ISBN 0-949009-37-7. — a 1956 case in Argentina exemplifying how both Spanish and Argentinian laws could apply to a birth aboard ship. The decision in the case cites "Birth on Board Ship". Spanish Encyclopedia. 23. p. 328..
- British Institute of International Affairs (1965). "Nationality in Public International Law". The British Year Book of International Law. 39. Hodder and Stoughton. p. 306.