The EUCAARI-LONGREX project was a series of coordinated research flights involving the FAAM BAe-146 and the Deutsches Zentrum fur Luft- und Raumfahrt (DLR) Falcon 20-E5 research aircraft. The aim of the campaign was to evaluate the climate impacts of aerosols over Europe with an emphasis on their relationship to long range transport processes. The 15 FAAM research flights during LONGREX covered a large spatial area, ranging from the western coast of Ireland to the boreal forests of Finland. A significant high-pressure system dominated the first week of the campaign, allowing for the repeated sampling of pollution as it circulated over Europe. This allowed us to examine the aging of the pollution as it travelled from east to west over Europe. The University of Manchester was responsible for measurements of aerosol composition, mixing state and cloud microphysical properties using a variety of instruments.