frontier zonemeans a zone which, as the crow flies, does not extend more than 15 kilometres from the frontier of a Member State and which includes the local administrative districts part of the territory of which lies within the zone;
frontier-zone workermeans any person whose normal activities require that he should go to the other side of the frontier on his work days.
private pleasure-sea-navigationmeans the use of an aircraft or a sea-going vessel by its owner or the natural or legal person who enjoys its use either through hire or through any other means, for purposes other than commercial and in particular other than for the carriage of passengers or goods or for the supply of services for consideration or for the purposes of public authorities;
sea travellersmeans any passengers travelling by air or sea other than private pleasure-flying or private pleasure-sea-navigation;
third countrymeans any country which is not a Member State of the European Union;