Article 2
For the purposes of this Directive: (a) "third-country national" means any person who is not a national of a Member State of the European Union, the Republic of Iceland or the Kingdom of Norway; (b) "requesting Member State" means the Member State which enforces a removal order in respect of a third-country national and requests transit via the airport of transit of another Member State; (c) "requested Member State" or "transit Member State" means the Member State via whose airport of transit the transit is to be effected; (d) "escort" means all persons from the requesting Member State responsible for accompanying the third-country national, including persons responsible for medical care and interpreters; (e) "transit by air" means the passage of the third-country national and, if necessary, the escort through the area of the airport of the requested Member State for the purposes of removal by air.