; and (2) in subsection (d), by striking 2023 and inserting 2028 . (i) National air grant fellowship program Section 131(d) of division V of the Consolidated Appropriations Act, 2021 ( 49 U.S.C. 40101 note) is amended by striking 2025 and inserting 2028 . IV MODERNIZING THE NATIONAL AIRSPACE SYSTEM 401. NextGen accountability task force (a) Establishment The Administrator shall establish a task force, to be known as the NextGen Accountability Task Force (referred to in this section as the Task Force ) to provide recommendations on the most effective operational metrics that can be used to assess the performance of the FAA in delivering and implementing quantifiable operational benefits to the national airspace system within the Next Generation Air Transportation System (NextGen) project. (b) Membership (1) In general The Task Force shall be composed of, at a minimum, representatives from— (A) the FAA; (B) trade associations representing avionics manufacturers; (C) trade associations representing air carriers (D) trade associations representing business or general aviation operators; (E) labor organizations representing air traffic controllers; and (F) any other interested parties that the Administrator determines may provide expertise and assist the Task Force to fulfill its obligations. (2) Appointment The Administrator shall appoint each member of the Task Force. (3) Vacancies A vacancy in the Task Force shall be filled in the manner in which the original appointment was made. (c) Duties The Task Force shall — (1) leverage current metrics used by the FAA to quantify the benefits of NextGen technology and investments; (2) validate current and establish additional metrics for the FAA to track national airspace system throughput and savings due to NextGen investments by calculating a weighted average by distance, on a per flight basis— (A) reduction and cumulative savings of track miles and time savings; (B) reduction and cumulative savings of emissions and fuel burn; (C) reduction of aircraft operation time