Passport-free zone From Wikipedia the free encyclopedia Passport-free zones may refer to: Common Travel Area Schengen Area (incl. Nordic Passport Union) Central America-4 Border Control Agreement Topics referred to by the same term This disambiguation page lists articles associated with the title Passport-free zone.If an internal link led you here, you may wish to change the link to point directly to the intended article. vteForms of economic integrationTrade bloc Preferential trading area Free-trade area Economic partnership Passport-free zone Single market Economic union Customs union Monetary union Customs and monetary union Economic and monetary union Complete economic integration Shared policies Fiscal union Social union Political union Theory Economic integration effects Friction of distance Harmonisation of law Theory of the second best Regions Europe Latin America Middle East North America