; and (ii) the individual— (I) is carrying a ticket in the name of the individual for a flight that is scheduled for departure from the covered airport within 24 hours or that has arrived at the airport within the preceding 24 hours; or (II) communicates the intention to obtain a ticket for departure referred to in subclause (I) at the covered airport and obtains and carries such ticket or does not obtain such ticket for a compelling reason. (C) Individuals shipping firearms An individual who possesses a firearm in a capacity relating to the shipment of the firearm in air commerce and who, by regulation, is authorized by the Administrator of the Federal Aviation Administration or the Administrator of the Transportation Security Administration to possess the firearm at the covered airport in such capacity. (D) Law enforcement officers An on-duty law enforcement officer of a State or political subdivision of a State, or an officer or employee of the Federal Government, who is authorized to carry a firearm. (E) Certain individuals on public transportation An individual passing through an airport on public transportation. (F) Additional authorized individuals An individual who is otherwise authorized by the Administrator of the Federal Aviation Administration or the Administrator of the Transportation Security Administration to possess a firearm at a covered airport. (4) Issuance of regulations Not later than one year after the date of enactment of this Act, the Administrator of the Transportation Security Administration shall issue regulations to carry out this subsection. (5) Definitions In this subsection: (A) Airport The term airport means an airport and any appurtenant building or area that is related to the operation of the airport, including a building or area on the site of the airport designed to— (i) receive passengers or cargo before or after a flight