need and the impact of installation and deployment on the national airspace system. (2) Electronic flight strips At a minimum, the Administrator shall implement electronic flight strips at the air traffic control towers of airports described in paragraph (1). (3) Flow management data and services Not later than 4 years after the date of enactment of this Act, if the Administrator finds that Terminal Flight Data Manager systems would be beneficial to safety or efficiency, the Administrator shall install Flow Management Data and Services at airports described under paragraph (1). (4) Appropriations The activities under paragraphs (1), (2), and (3) of this subsection shall be contingent on the appropriation of funds to carry out this subsection. (f) Aeronautical information management systems (1) In general Not later than 3 years after the date of enactment of this Act, the Administrator shall fully modernize the aeronautical information management systems of the FAA to improve the functionality, useability, durability, and reliability of such systems used in the national airspace system. (2) Requirements In carrying out paragraph (1), the Administrator shall— (A) improve the distribution of critical safety information to pilots, air traffic control, and other relevant aviation stakeholders