Dual Gateway Policy Review Act - Directs the Secretary of State to: (1) review the Irish Government's dual gateway policy (which requires certain air carriers serving Dublin Airport to undertake equal numbers of flights annually to Shannon and Dublin airports), and determine the effects such policy's discontinuation might have on the economies of the United States and Western Ireland before taking any diplomatic action that could end such policy; and (2) consider the effects such discontinuation might have on U.S. businesses operating in Western Ireland and Irish businesses operating in and around Shannon Airport.