transmitters. Sec. 617. Automated weather observing systems maintenance improvements. Sec. 618. Contract Tower Program. Sec. 618A. Contract tower program safety enhancements. Sec. 619. Remote towers. Sec. 620. Grant assurances. Sec. 620A. GAO study on fee transparency by fixed based operators. Sec. 620B. Aviation fuel in Alaska. Sec. 621. Civil penalties for grant assurances violations. Sec. 622. Community use of airport land. Sec. 623. Buckeye 940 release of deed restrictions. Sec. 624. Clarifying airport revenue use of local general sales taxes. Sec. 625. AIP handbook review. Sec. 626. PFAS-related resources for airports. Sec. 627. Progress reports on the national transition plan related to a fluorine-free firefighting foam. Sec. 628. Review of airport layout plans. Sec. 629. NEPA purpose and need statements. Sec. 630. Passenger facility charge streamlining. Sec. 631. Use of passenger facility charges for noise barriers. Sec. 632. Automated weather observing systems policy. Sec. 633. Infrastructure Investment and Jobs Act implementation. Sec. 634. Report on airport notifications. Sec. 635. Coastal airports resiliency study. Sec. 636. Electric aircraft infrastructure. Sec. 637. Study on competition and airport access. Sec. 638. Regional airport capacity study. Sec. 639. Study on autonomous and electric-powered track systems. Sec. 640. Special rule for reclassification of certain unclassified airports. Sec. 641. General aviation airport runway extension pilot program. Sec. 642. Applicability of screening requirements. Sec. 643. Additional permitted uses of passenger facility charge revenue. Sec. 644. Airport infrastructure resilience pilot program. Sec. 645. Prohibition on provision of airport improvement grant funds to certain entities that have violated intellectual property rights of United States entities. Sec. 646. Ensuring that certain projects related to natural hazards and emergency management are eligible for funding under the Federal Aviation Administration's airport improvement program. Sec. 647.