# Commission Regulation (EC) No 2150/2005 of 23 December 2005 laying down common rules for the flexible use of airspace (Text with EEA relevance), Article 2: Definitions

Extent: E+W+S+N.I.

1. For the purpose of this Regulation the definitions established by Regulation (EC) No 549/2004 shall apply.
2. In addition to the definitions referred to in paragraph 1, the following definitions shall apply:
(a) ‘airspace management cell (AMC)’ means a cell responsible for the day-to-day management of airspace;
(b) ‘airspace reservation’ means a defined volume of airspace temporarily reserved for exclusive or specific use by categories of users;
(c) ‘airspace restriction’ means a defined volume of airspace within which, variously, activities dangerous to the flight of aircraft may be conducted at specified times (a ‘danger area’); or such airspace situated above the land areas or territorial waters of a State, within which the flight of aircraft is restricted in accordance with certain specified conditions (a ‘restricted area’); or airspace situated above the land areas or territorial waters of a State, within which the flight of aircraft is prohibited (a ‘prohibited area’);
(d) ‘airspace structure’ means a specific volume of airspace designed to ensure the safe and optimal operation of aircraft;
(e) ‘air traffic services unit’ (ATS unit) means a unit, civil or military, responsible for providing air traffic services;
(f) ‘civil-military coordination’ means the coordination between civil and military parties authorised to make decisions and agree a course of action;
(g) ‘controlling military unit’ means any fixed or mobile military unit handling military air traffic and/or pursuing other activities which, owing to their specific nature, may require an airspace reservation or restriction;
(h) ‘cross-border airspace’ means an airspace structure extending across national borders and/or the boundaries of flight information regions;
(i) ‘flight intention’ means the flight path and associated flight data describing the planned trajectory of a flight to its destination, as updated at any moment;
(j) ‘flight path’ means the path of an aircraft through the air, defined in three dimensions;
(k) ‘real-time’ means the actual time during which a process or event occurs;
(l) ‘separation’ means spacing between aircraft, levels or tracks;
(m) ‘users’ means civil or military aircraft operating in the air as well as any other parties requiring airspace.

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Source: https://www.legislation.gov.uk/eur/2005/2150/article/2 (the official version)
Page: https://openlegislation.uk/eu-regulation-2005-2150/article-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.