CFR > Title 49 - Transportation > SUBTITLE B—Other Regulations Relating to Transportation > CHAPTER XII—TRANSPORTATION SECURITY ADMINISTRATION, DEPARTMENT OF HOMELAND SECURITY (Parts 1500–1580) > SUBCHAPTER C—CIVIL AVIATION SECURITY (Parts 1540–1562) > PART 1542—AIRPORT SECURITY > SUBPART A—General (§1542.1 to §1542.5)