14 C.F.R. § 135.119 Prohibition against carriage of weapons.
Title 14 - Aeronautics and Space
No person may, while on board an aircraft being operated by a certificate holder, carry on or about that person a deadly or dangerous weapon, either concealed or unconcealed. This section does not apply to— (a) Officials or employees of a municipality or a State, or of the United States, who are authorized to carry arms; or (b) Crewmembers and other persons authorized by the certificate holder to carry arms.
Title 14: Aeronautics and Space
PART 135—OPERATING REQUIREMENTS: COMMUTER AND ON DEMAND OPERATIONS AND RULES GOVERNING PERSONS ON BOARD SUCH AIRCRAFT
Subpart B—Flight Operations
§ 135.119 Prohibition against carriage of weapons.