; (2) efficiencies of allowing the safe transportation of hazardous materials by unmanned aircraft systems; and (3) the risk profile of the transportation of hazardous materials by unmanned aircraft systems, taking into consideration the likelihood, if any, that such operations will carry small quantities of hazardous materials. (c) Conformity of hazardous materials regulations The Secretary shall make such changes as necessary to conform the hazardous materials regulations under parts 173 and 175 of title 49, Code of Federal Regulations, to this section. Such changes shall not be required before the Secretary exercises the authority provided for in this section. (d) Definitions In this section: (1) Hazardous materials The term hazardous materials has the meaning given that term in section 5102 of title 49, United States Code. (2) Unmanned aircraft system The term unmanned aircraft system has the meaning given such term in section 44801 of title 49, United States Code. B Advanced Air Mobility 821. Sense of Congress on FAA leadership It is the sense of Congress that— (1) the United States should take actions to position itself as a global leader in advanced air mobility; and (2) as such a global leader, the FAA should— (A) prioritize its work on the type certification of aircraft; (B) publish in line with its stated deadlines rulemakings and policy necessary to enable commercial operations, such as the powered-lift Special Federal Aviation Regulation (SFAR); (C) work with global partners to promote acceptance of advanced air mobility products