of the pilot program under subsection (d) established under this section, the Administrator shall brief the appropriate committees of Congress on the progress of such pilot program, including any implementation challenges of the program, detailed metrics of the program, and any recommendations to achieve the adoption of FPO. (c) Trajectory-based operations defined In this section, the term trajectory-based operations means an air traffic flow management method for strategically planning, managing, and optimizing flights that uses time-based management, performance-based navigation, and other capabilities and processes to achieve air traffic flow management operational objectives and improvements. (d) Sunset The pilot program under this section shall terminate on October 1, 2028. 610. Extension of enhanced air traffic services pilot program Section 547 of the FAA Reauthorization Act of 2018 ( 49 U.S.C. 40103 note) is amended— (1) by striking subsection (d) and inserting the following: (d) Definitions In this section: (1) Certain Next Gen avionics The term certain NextGen avionics means those avionics and baseline capabilities as recommended in the report of the NextGen Advisory Committee titled Minimum Capabilities List (MCL) Ad Hoc Team NAC Task 19–1 Report , issued on November 17, 2020. (2) Preferential basis The term preferential basis means prioritizing aircraft equipped with certain NextGen avionics by providing them more efficient service, shorter queuing, or priority clearances to the maximum extent possible without reducing overall capacity or safety of the national airspace system.