; and (2) any disagreements with the recommendations, including the rationale for each disagreement and the reasons for the disagreement. (e) Installation of secondary cockpit barriers of existing aircraft Not later than 36 months after the date of the submission of the report under subsection (d), the Administrator shall, taking into consideration the final reported findings and recommendations of the aviation rulemaking committee, issue a final rule requiring installation of a secondary cockpit barrier on each commercial passenger aircraft operated under the provisions of part 121 of title 14, Code of Federal Regulations. 351. Part 135 duty and rest (a) Part 91 tail–end ferry rulemaking Not later than 3 years after the date of enactment of this Act, the Administrator shall require that any operation conducted by a flight crewmember during an assigned duty period under the operational control of an operator holding a certificate under part 135 of title 14, Code of Federal Regulations, before, during, or after the duty period (including any operations under part 91 of title 14, Code of Federal Regulations), without an intervening rest period, shall count towards the flight time and duty period limitations of such flight crewmember under part 135 of title 14, Code of Federal Regulations. (b) Record keeping Not later than 1 year after the date of enactment of this Act, the Administrator shall update any Administration policy and guidance regarding complete and accurate record keeping practices for operators holding a certificate under part 135 of title 14, Code of Federal Regulations, in order to properly document, at a minimum— (1) flight crew assignments; (2) flight crew prospective rest notifications; (3) compliance with flight and duty times limitations and post-duty rest requirements