19.7.2016 Official Journal of the European Union EN L 194/27 ANNEX II TYPES OF ENTITIES FOR THE PURPOSES OF POINT (4) OF ARTICLE 4 Sector 1. Energy Subsector (a) Electricity Type of entity — Electricity undertakings as defined in point (35) of Article 2 of Directive 2009/72/EC of the European Parliament and of the Council (1), which carry out the function of ‘supply’ as de­ fined in point (19) of Article 2 of that Directive — Distribution system operators as defined in point (6) of Article 2 of Directive 2009/72/EC — Transmission system operators as defined in point (4) of Article 2 of Directive 2009/72/EC (b) Oil — Operators of oil transmission pipelines — Operators of oil production, refining and treatment facilities, storage and transmission (c) Gas — Supply undertakings as defined in point (8) of Article 2 of Di­ rective 2009/73/EC of the European Parliament and of the Council (2) — Distribution system operators as defined in point (6) of Article 2 of Directive 2009/73/EC — Transmission system operators as defined in point (4) of Article 2 of Directive 2009/73/EC — Storage system operators as defined in point (10) of Article 2 of Directive 2009/73/EC — LNG system operators as defined in point (12) of Article 2 of Directive 2009/73/EC — Natural gas undertakings as defined in point (1) of Article 2 of Directive 2009/73/EC — Operators of natural gas refining and treatment facilities 2. Transport (a) Air transport — Air carriers as defined in point (4) of Article 3 of Regulation (EC) No 300/2008 of the European Parliament and of the Council (3) — Airport managing bodies as defined in point (2) of Article 2 of Directive 2009/12/EC of the European Parliament and of the Council (4), airports as defined in point (1) of Article 2 of that Directive, including the core airports listed in Section 2 of Annex II to Regulation (EU) No 1315/2013 of the Euro­ pean Parliament and of the Council (5), and entities operating ancillary installations contained within airports