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As part of the ENDEAVOUR project (Evolutionary Network-Centric Technologies for Four Dimensional Trajectory (4DT) Based Operations in Europe: ATM and Avionics Systems for Intent Validation, Real-Time Optimisation and Uncertainty-Resilient Operations), a novel 4DT Planning, Negotiation and Validation (4-PNV) system was developed for integration into the next generation Communications, Navigation and Surveillance/Air Traffic Management (CNS/ATM) environment. The 4-PNV system provides 4DT negotiation and validation capabilities for the Next Generation ATM, in combination with the Next Generation of Flight Management Systems (NG-FMS) and Next Generation Air-to-ground Data-Link (NG-ADL) that are also being developed. The NGFMS generates globally optimal trajectories based on environmental and operational weightings, meeting the combined objectives of the Single European Sky ATM …