No persons except airmen, duly authorized personnel, passengers, or other persons going to or from aircraft personally conducted by airmen or airport attendants, shall be permitted to enter an aircraft apron area. Any person or persons so excepted does not have the privilege of unrestricted use of the apron. These privileges are confined to the necessary use of such space in connection with flights or routine duties. (Ord. 1802 NCS §4 (part), 1990.)