The FAA is developing a notice of proposed rulemaking (NPRM) addressing special requirements for the interiors of transport-category business jets. If enacted, these standards can be used instead of the current requirements, which were originally intended for transport-category airplanes operated by airlines. Additionally, the new rules would “supplement the requirements for operation under the air traffic and general operating rules” of Part 91. An NPRM is scheduled to be published before year-end.