Pirate Ship or Aircraft
A ship or aircraft is considered a pirate ship or aircraft if it is intended by the persons in dominant control to be used for the purpose of committing one of the acts referred to in article 101. The same applies if the ship or aircraft has been used to commit any such act, so long as it remains under the control of the persons guilty of that act.
Source: United Nations Convention on the Law of the Sea (UNCLOS), 1982. Legislation