; (B) the requirements for and impact of expanding the dual-link architecture that is used below an altitude of FL180 to any altitude below the current radar floor; (C) the costs and benefits of equipage; and (D) the cost and benefits of any accommodation made for aircraft with inoperable ADS-B out equipment. (2) Annual briefings Not later than 1 year after the date of enactment of this section, and annually thereafter through 2025, the Administrator shall brief the appropriate committees of Congress on the results of the study conducted under paragraph (1), including any updates thereof. (b) Vehicle-to-Vehicle link program Not later than 270 days after the date of enactment of this section, the Administrator, in coordination with the Administrator of the National Aeronautics and Space Administration and the Chair of the Federal Communications Commission, shall establish an interagency coordination program to advance Vehicle-to-Vehicle link programs that— (1) enable the real-time digital exchange of key information between nearby aircraft; and (2) are not reliant on ground infrastructure or air-to-ground communication links. 411. 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 (1) Certain Next Gen avionics The term certain NextGen avionics means those avionics and baseline capabilities as recommended in the Minimum Capabilities List (MCL) Ad Hoc Team, NextGen Advisory Committee (NAC) Task 19-1 Report completed in November 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.