In an effort to improve the effciency of air traffic operations, whilst reducing the envi- ronmental impact on aviation and increase capacity, 4D trajectory optimisation has shown good potential. In previous research the authors have described a framework where com- plex departure routes can be optimised, producing con ict free fuel optimal trajectories. The research in this paper extends this concept to account for prediction uncertainty of future states of intruding traffic. It is proposed to continuously monitor the surounding traffic and recompute the ownship trajectory whenever a deviation from nominal traffic behavior arises. The effectiveness of the conformance monitoring function is evalutated in a scenario with two aircraft ying standard departing procedures from Barcelona and Reus airports.

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