Airbus, through its partnership with the Perlan Project, is investigating how to clean vapor trails from the high-flown paths traversed by airliners. Through its pair of Blue Condor jet-powered sailplanes, Airbus and Perlan are working toward a contrail-measuring mission in 2024. Hydrogen, the most abundant element in the universe, has been a rarity in the aviation world, other than in well-publicized events involving gas-fueled conflagrations. (Whether the H2 carrying the Hindenburg aloft or the fabric skin covering the great ship’s frame caused the fire at Lakehurst, New Jersey in 1937 is still somewhat controversial.) Regardless, the disaster brought about a deep mistrust of hydrogen that persists to this day. Airbus, along with the Perlan Project, looks forward to exploiting H2’s advantages while overcoming its undeserved stigma and surprising issues. Perlan’s Greater Mission The Perlan Project has achieved an enviable string of record flights culminating in the 2018 altitude record of 76,114 feet. Carrying CubeSats filled with science experiments developed by …