; (3) applicable local laws or ordinances requiring use of airport revenue for non-airport purposes; (4) whether repealing the exception would improve the long-term financial performance of impacted airports; and (5) any other practical implications of repealing the exception for airports or the national aviation system. (c) Report Not later than 18 months after the date of enactment of this Act, the Comptroller General shall submit to the Committee on Transportation and Infrastructure of the House of Representatives and the Committee on Commerce, Science, and Transportation of the Senate a report on the results of the study. 558. Geosynthetic materials The Administrator of the Federal Aviation Administration, to the extent practicable, shall encourage the use of durable, resilient, and sustainable materials and practices, including the use of geosynthetic materials and other innovative technologies, in carrying out the activities of the Federal Aviation Administration. 559. Rule for animals Not later than 1 year after the date of enactment of this Act, the Secretary shall issue a rule to require each primary airport (as defined in section 47102 of title 49, United States Code) to provide a designated area for animals, traveling with their owners, to relieve themselves. 560. Enhanced air traffic services (a) In general Not later than 180 days after the date of enactment of this Act, the Administrator shall establish a pilot program to provide air traffic control services on a preferential basis to aircraft equipped with certain NextGen avionics that— (1) lasts at least 2 years