1 rich Libsyn https://www.libsyn.com 90 600 Pushed by the drive for sustainability, novel propulsion systems that until relatively recently seemed years away are quickly coming into focus. Organizers of the 25th&amp;nbsp;International Society for Air Breathing Engines (ISABE) conference discuss some of the fast-emerging technologies. Aviation Week's Check 6 Podcast http://www.aviationweek.com/podcasts <iframe title="Libsyn Player" style="border: none" src="//html5-player.libsyn.com/embed/episode/id/24669093/height/90/theme/custom/thumbnail/yes/direction/forward/render-playlist/no/custom-color/88AA3C/" height="90" width="600" scrolling="no" allowfullscreen webkitallowfullscreen mozallowfullscreen oallowfullscreen msallowfullscreen></iframe> https://assets.libsyn.com/secure/item/24669093