ATCT-
(See TOWER.)
ATD-
(See ALONG-TRACK DISTANCE.)
ATIS-
(See AUTOMATIC TERMINAL INFORMATION SERVICE.)
ATIS [ICAO]-
(See ICAO Term AUTOMATIC TERMINAL
INFORMATION SERVICE.)

ATS ROUTE [ICAO]- A specified route designed for channelling the flow of traffic as necessary for the provision of air traffic services.
Note: The term “ATS Route” is used to mean vari-ously, airway, advisory route, controlled or uncontrolled route, arrival or departure, etc.
AUTOLAND APPROACH- An autoland approach is a precision instrument approach to touchdown and, in some cases, through the landing rollout. An autoland approach is performed by the aircraft autopilot which is receiving position information and/or steering commands from onboard navigation equipment.
Note: Autoland and coupled approaches are flown in VFR and IFR. It is common for carriers to require their crews to fly coupled approaches and autoland approaches (if certified) when the weather condi-tions are less than approximately 4,000 RVR.
(See COUPLED APPROACH.)
AUTOMATED INFORMATION TRANSFER- A precoordinated process, specifically defined in facility directives, during which a transfer of altitude control and/or radar identification is accomplished without verbal coordination between controllers using information communicated in a full data block.
AUTOMATED MUTUAL‐ASSISTANCE VESSEL RESCUE SYSTEM- A facility which can deliver, in a matter of minutes, a surface picture (SURPIC) of vessels in the area of a potential or actual search and rescue incident, including their predicted positions and their characteristics.