Federal Aviation Administration Advisory Circular: Aviation Security: Air Taxi Commercial Operators (ATCOs) [open pdf - 941KB]
"This Circular provides recommended security measures applicable to ATCO [Air Taxi Commercial Operators] operations that should minimize the effects of crimes directed against air transportation. It advises ATCOs of the availability of operations specifications whereby they may implement security procedures to improve their security posture and facilitate operations that interface with certain 121 air carrier operators required to have security programs. Guidance is also provided regarding Federal Aviation Administration [FAA] security requirements for the discharge of ATCO passengers into Federal Aviation Regulation Part 121 certificate holders' sterile concourses. [...] While establishment of a security program encompassing the above recommendations is not required, it is believed that such action will assure consistency in the application of security procedures and reduce the possibility of successful criminal acts being perpetrated against an ATCO's passengers and aircraft. Program approval by FAA and implementation of the operations specifications by the ATCO permits the ATCO to deplane passengers in a sterile concourse and provides for the transfer or interline checked baggage to Part 121 carriers without further screening."
Federal Aviation Administration Advisory Circular (AC) No. 135-4A
Federal Aviation Administration: http://www.airweb.faa.gov/