In the aerospace project Blue Condor, Airbus, Perlan, and DLR collaborated to investigate the impact of contrails from direct hydrogen combustion, aiming to understand the potential benefits of hydrogen-powered aircraft on climate effects. Contrails in the upper troposphere significantly affect air traffic's climate impact, and the lack of knowledge regarding contrails from hydrogen direct combustion led to the launch of this project. The research involved conducting flight tests with hydrogen turbojet engines, focusing on the microphysical properties of contrails and emission measurements under real atmospheric conditions. The study revealed differences in contrails from hydrogen combustion engines compared to traditional kerosene combustion, highlighting the potential of hydrogen engines to minimize contrail lifespan and warming effects. The project employed modified aircraft, measurement technologies, and model simulations to gather and analyze data for future climate impact assessments. The partners are enthusiastic about the project's implications for understanding and potentially mitigating the climate impact of contrails from hydrogen-powered aircraft in the future.