http://www.legislation.gov.uk/eur/2019/123/article/4Commission Implementing Regulation (EU) 2019/123 of 24 January 2019 laying down detailed rules for the implementation of air traffic management (ATM) network functions and repealing Commission Regulation (EU) No 677/2011 (Text with EEA relevance)Commission Implementing Regulation (EU) 2019/123Commission Implementing Regulation (EU) 2019/123 of 24 January 2019 laying down detailed rules for the implementation of air traffic management (ATM) network functions and repealing Commission Regulation (EU) No 677/2011 (Text with EEA relevance)King's Printer of Acts of Parliamenthttps://webarchive.nationalarchives.gov.uk/eu-exit/https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX:32019R0123texttext/xmlen2024-05-19Expert Participation2020-12-31 CHAPTER II <Strong>ORGANISATION AND MANAGEMENT OF NETWORK FUNCTIONS</Strong> Annexes 1 to 4 Article 4Annexes 1 to 4 make provision about the European route network design function, the air traffic flow management function, the radio frequency function and the transponder code function.Art. 4 substituted (31.12.2020) by The Air Traffic Management (Amendment etc.) (EU Exit) Regulations 2020 (S.I. 2020/694), regs. 1(2), 20