Irish Nationality and Citizenship Act, 1956

Citizenship of persons born on ships and aircraft.

13.—(1) A person born in an Irish ship or an Irish aircraft wherever it may be is deemed to be born in Ireland.

(2) A person who is born the child of aliens in a foreign ship or in a foreign aircraft while the ship or aircraft is within Ireland or its territorial seas is deemed not to be born in Ireland, if at the birth the child acquired the citizenship of another country.