Division 2 The Secretary of State and air navigation service providers ..., shall, through cooperative decision-making, ensure that the following principles apply to airspace utilisation and capacity management:F1F2

airspace structures shall be planned to facilitate flexible and timely airspace use and management with regard to routing options, traffic flows, sector configuration schemes and the configuration of other airspace structures;

airspace structures should accommodate the establishment of additional route options while ensuring their compatibility with the existing capacity considerations and sector design limitations.