Research aircraft HALO and Falcon (IMAGE) Max Planck Institute for Chemistry Caption The research aircraft HALO and Falcon are measuring concentrations of trace gases and pollutants in the air over European urban areas and in the flight corridor to North America as part of the BLUESKY project. Credit DLR Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.