The world witnessed a significant milestone in aviation with the first in-flight measurements of contrails from a hydrogen-powered aircraft, the Blue Condor glider, conducted in Minden, Nevada, USA. This groundbreaking project, involving Airbus, the Perlan team, and the German Aerospace Center (DLR), aimed at understanding the climate impact of contrails produced by hydrogen combustion. The research focused on analyzing ice crystal formation, trace gases, and aerosols in the exhaust of hydrogen-powered aircraft, offering valuable insights for climate-compatible flight. The Blue Condor project compared contrail formation between hydrogen and kerosene-fueled engines, highlighting the potential climate benefits of hydrogen propulsion. The experiment involved the Perlan team modifying an Arcus glider to accommodate a hydrogen engine, with the aircraft reaching altitudes over nine kilometers to study contrail formation. Data collected during the flight tests is currently under evaluation and will be published in a scientific paper. The findings indicate that contrails from direct hydrogen combustion differ from traditional contrails, forming at higher temperatures and lower altitudes due to higher water vapor emissions. Unlike kerosene engines, hydrogen combustion engines ideally produce exhaust gases free of particulate emissions, impacting ice crystal formation. These pioneering measurements mark a significant step towards understanding and enhancing the climate compatibility of hydrogen propulsion in aviation.