; and (C) how the program described in paragraph (1) engages air carriers and relevant industry stakeholders, including flight schools, to ensure efficient compliance with part 60 of title 14, Code of Federal Regulations. (3) Report Not later than 18 months after the date of enactment of this Act, the Comptroller General shall submit to the appropriate committees of Congress a report on the findings of the study conducted under paragraph (1). 326. Briefing on agricultural application approval timing Not later than 240 days after the date of enactment of this Act, the Administrator shall brief the appropriate committees of Congress on the amount of time the application approval process takes for agricultural aircraft operations under part 137 of title 14, Code of Federal Regulations. 327. Sense of Congress regarding safety and security of aviation infrastructure It is the sense of Congress that aviation provides essential services critical to the United States economy and that it is important to ensure the safety and security of aviation infrastructure and protect such infrastructure from unlawful breaches with appropriate legal safeguards. 328. Restricted category aircraft maintenance and operations Notwithstanding any other provision of law, the Administrator shall have sole regulatory and oversight jurisdiction over the maintenance and operations of aircraft owned by civilian operators and type-certificated in the restricted category under section 21.25 of title 14, Code of Federal Regulations. 329. Aircraft interchange agreement limitations (a) Study Not later than 90 days after the date of enactment of this Act, the Administrator shall conduct a study of foreign interchange agreements. (b) Contents In carrying out the study required under subsection (a), the Administrator shall address the following: (1) Methods for updating regulations under part 121.569 of title 14, Code of Federal Regulations, for foreign interchange agreements. (2) Time limits for foreign aircraft interchange agreements. (3) Minimum