(The Hague, December 16, 1970) Formally called the Convention for the Suppression of Unlawful Seizure of. The supplements provisions on unlawful seizure of aircraft found in the . The obligates a state, when an alleged offender is present in its territory and the state does not proceed with extradition, to establish its jurisdiction over the offense. The includes additional provisions on prosecution and extradition of offenders. The was ratified by the United States on September 14, 1971.