HYSKY Society and the Vertical Flight Society’s CAT Discussion Group convened a lively, deeply practical webinar on how Supplemental Type Certificates (STCs) are accelerating the entry of advanced propulsion and systems into real aircraft. Moderated by Mike Hirschberg (H2 Advisors), with featured talks by David Webber (FAA) and Ken Swartz (Aeromedia Consultants), the session blended policy mechanics, field-proven history, and what’s next for eVTOLs, hydrogen, hybrid-electric,