Acronym for "Traffic Flow Management System." TFMS is the central computer system that the FAA uses to receive information about planned and active flights; generate forecasts of demand from the current time to several hours ahead; and present this information to air traffic management personnel. TFMS is the system that coordinates and ex [..]

Abbreviation for "Jacksonville Center (ARTCC)."

Tier refers to the scope of a TMI. 1ST TIER refers to those enroute centers immediately adjacent to the one where a TMI or a constraint in place. For example, if there is a 1ST TIER ground stop in place for IAD, which is in Washington Center (ZDC), that would mean that all traffic departing to IAD from ZDC, Boston Center (ZBW), New York Center (ZNY [..]

Tier refers to the scope of a TMI. 2ND TIER refers to those enroute centers immediately adjacent to the one where a TMI or a constraint in place, plus the centers immediately adjacent to those (meaning a 2ND TIER TMI would capture more traffic than a 1ST TIER TMI). For example, if there is a 2ND TIER ground delay program (GDP) in place at EWR, whic [..]

Acronym for "Airport Acceptance Rate." The AAR is the number of arrivals an airport is capable of accepting each hour. The AAR can vary depending on weather, construction, equipment outages, etc.

Various abbreviations that FAA uses for "aircraft."

Advisories are issued by the FAA's Air Traffic Control System Command Center, whenever they need to communicate important information about the National Airspace System (NAS). View the Advisories

Common abbreviations for "Advisory."

Acronym for "Airspace Flow Program." An AFP is a traffic management initiative (TMI) used to control traffic through a particular section of airspace. Basically, a line (called a Flow Constrained Area or FCA) is drawn on a map, where a constraint, such as thunderstorms, is expected to appear. Any traffic crossing that line is measured and [..]

Abbreviation for "Atlantic Routes." The ARs are a network of offshore routes along the east coast, commonly used by traffic between the northeast and Florida.