; (B) a powered lift aircraft; (C) a technology related to— (i) advanced air mobility; (ii) the ability of an aircraft to detect surroundings and avoid impacts; (iii) autonomous functioning of aircraft; (iv) supersonic aircraft capabilities; (v) electric or hydrogen based aircraft propulsion; or (vi) evolving aerospace operations including new aircraft, airport, weather, or info-centric and digital systems; or (D) any other aviation-related technology that the Deputy Administrator determines qualifies as an advanced aviation system that could feasibly be integrated into the national airspace system. (4) Operational approval application The term operational approval application means an application for the operation of an advanced aviation system in the national airspace system submitted pursuant to section 44701 or 44807 of title 49, United States Code, or any other provision of law related to such operation. (5) Secretary The term Secretary means the Secretary of Transportation.