Impacts of aviation emissions can only be determined from emissions databases. Currently available global emissions databases are~10 years out of date and cannot meet the current needs of policy makers and scientists. This project (AERO2K) will deliver data required for European and international policy development and future assessments of aircraft impacts on climate. AERO2K will establish a new global 4D inventory of fuel usage and emissions of pollutants (NOx, CO, HCs, CO2, particles) relevant to aircraft impacts on the upper atmosphere. These parameters will be derived from movements of civil (all categories) and military aviation with a spatial resolution of I degree lat/long by 0.5 km in height, by month and include high time resolution (hours) for representative days. A 25-year forecast will also be provided by considering the latest forecasting techniques used by industry, government and air traffic management. A top team of experts from science, technology, industry and policy makers has been assembled for AERO2K