US lawFederal (United States)RegulationsTitle 49 CFR — TransportationChapter XII — TRANSPORTATION SECURITY ADMINISTRATION, DEPARTMENT OF HOMELAND SECURITYPart 1540 — CIVIL AVIATION SECURITY: GENERAL RULESSubpart A — General1540.149 C.F.R. § 1540.1Applicability of this subchapter and this part.Last amended: 2016Year: 2026Length: 12 wordsOfficial source Cite as 49 C.F.R. § 1540.1 (2026)This subchapter and this part apply to persons engaged in aviation-related activities.Next49 C.F.R. § 1540.3