; and (2) continuing the Administration’s research program is necessary to assess the impact in a relevant environment of commercial supersonic flight operations and provide the basis for establishing appropriate sonic boom standards for such flight operations. (b) Roadmap for supersonic research (1) In general Not later than 1 year after the date of enactment of this Act, the Administrator shall develop and submit to the appropriate committees of Congress a roadmap that allows for flexible funding profiles for supersonic aeronautics research and development. (2) Objective The objective of the roadmap is to develop and demonstrate, in a relevant environment, airframe and propulsion technologies to minimize the environmental impact, including noise, of supersonic overland flight in an efficient and economical manner. (3) Contents The roadmap shall include— (A) the baseline research as embodied by the Administration’s existing research on supersonic flight; (B) a list of specific technological, environmental, and other challenges that must be overcome to minimize the environmental impact, including noise, of supersonic overland flight; (C) a research plan to address the challenges under subparagraph (B), including a project timeline for accomplishing relevant research goals; (D) a plan for coordination with stakeholders, including relevant government agencies and industry