The overall objective of FlyATM4E is to develop a concept to identify climate-optimised aircraft trajectories in which ATM can help to provide a robust and eco-efficient reduction in aviation’s climate impact and estimate mitigation potential, taking into account CO2 and non-CO2 emissions through MET data, ensemble prediction and eco-efficient trajectories. FlyATM4E will consider the effect of emissions of CO2, NOx, H2O, and particulates on the atmosphere via concentration changes of radiative active species, comprising effects on ozone, methane and contrail-cirrus.

This overall objective is subdivided into four specific objectives of the project FlyATM4E, which are to

• Objective O1: advance concepts to assess the climate impact of ATM operations which integrates an adequate representation of uncertainties, including CO2, contrails, ozone, methane and water vapour climate effects, from weather forecast as well as climate science, and to provide concepts for climate information enabling eco-efficient aircraft trajectories.
• Objective O2: investigate aviation’s climate impact mitigation potential by developing robust flight planning algorithms through integration of uncertainties from the climate impact analysis and ensemble weather forecasts in ATM.
• Objective O3: identify eco-efficient aircraft trajectories and related weather situations, which enable a reduction of both climate impact and operational costs (“Win-Win”) by avoiding ATM inefficiencies; or which largely reduce the climate impact of aviation at almost unchanged costs by avoiding extreme climatesensitive regions (“Cherry-Picking”).
• Objective O4: provide recommendations for target stakeholders on policy actions and supporting measures to implement eco-efficient aircraft trajectories enabled by a better understanding of the climate impact of individual aircraft trajectories.