49 U.S.C. § 46504 : US Code - Section 46504: Interference with flight crew members and attendants

      An individual on an aircraft in the special aircraft jurisdiction
    of the United States who, by assaulting or intimidating a flight
    crew member or flight attendant of the aircraft, interferes with
    the performance of the duties of the member or attendant or lessens
    the ability of the member or attendant to perform those duties, or
    attempts or conspires to do such an act, shall be fined under title
    18, imprisoned for not more than 20 years, or both. However, if a
    dangerous weapon is used in assaulting or intimidating the member
    or attendant, the individual shall be imprisoned for any term of
    years or for life.