COMMISSION 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 ANNEX I THE EUROPEAN ROUTE NETWORK DESIGN FUNCTION ANNEX II AIR TRAFFIC FLOW MANAGEMENT FUNCTION Appendix List of the ICAO provisions for the purpose of air traffic flow management ANNEX III THE RADIO FREQUENCY FUNCTION ANNEX IV THE RADAR TRANSPONDER CODES FUNCTION ANNEX V TEMPLATE FOR NETWORK STRATEGY PLAN ANNEX VI TEMPLATE FOR NETWORK OPERATIONS PLAN Appendix 1 Area Control Centres (ACCs) Appendix 2 Airports