Section 1544.1 - Applicability of this part(a) This part prescribes aviation security rules governing the following: (1) The operations of aircraft operators holding operating certificates under 14 CFR part 119 for scheduled passenger operations, public charter passenger operations, private charter passenger operations; the operations of aircraft operators holding operating certificates under 14 CFR part 119 operating aircraft with a maximum certificated takeoff weight of 12,500 pounds or more; and other aircraft operators adopting and obtaining approval of an aircraft operator security program.(2) Each law enforcement officer flying armed aboard an aircraft operated by an aircraft operator described in paragraph (a)(1) of this section.(3) Each aircraft operator that receives a Security Directive or Information Circular and each person who receives information from a Security Directive or Information Circular issued by TSA.(b) As used in this part, "aircraft operator" means an aircraft operator subject to this part as described in § 1544.101 . 67 FR 8364 , Feb. 22, 2002, as amended at 67 FR 8209 , Feb. 22, 2002