ASPM Advisories: Definitions of Variables
The following definitions define the fields in ASPM Advisories reports:
- ADV. A numeric identifier for the advisories associated with a TMI. Several advisories may be issued for one instance of a traffic management initiative. Advisories may specify the initiation, modification, and cancellation of the TMI. Clicking on the hyperlink in the report will allow the user to view the advisory detail.
- AFP. The number of Airspace Flow Programs in effect for the specified date(s). An AFP is a traffic management initiative that identifies en route constraints en route and distributes Expect Departure Clearance Times (EDCT) to aircraft with flight plans through that airspace to meter the demand through the area. The principal goal is to provide en route traffic management during severe weather events, but they are also applied to other constraints.
- CTOP. The number of Collaborative Trajectory Options Programs in effect for the specified date(s). A CTOP is a traffic management initiative that automatically assigns delay and/or reroutes aircraft around one or more flow constrained areas. CTOP is collaborative in that it allows operators to submit a set of desired reroute options in advance of the issuance of the program, and may allow aircraft to avoid GDPs.
- GDP. The number of Ground Delay Programs affecting arrivals for the specified facility(ies) and date(s). GDPs require aircraft to be held on the ground at the departure airport due to congestion or other conditions at the destination airport or e route. Flights that are destined to the affected airport are issued Expected Departure Clearance Times (EDCT) and not permitted to depart until their Expected Departure Clearance Time. ECDTs are calculated in such a way as to meter the rate that traffic arrives at the affected airport; ensuring that demand is equal to acceptance.
- GS. The number of Ground Stops affecting arrivals for the specified facility(ies) and date(s). Ground Stops are initiated when the projected traffic demand is expected to exceed the airport's acceptance rate for a short period of time, to temporarily stop traffic allowing for the implementation of a longer-term solution, such as a Ground Delay Program or when the affected airport's acceptance rate has been reduced to zero. Flights that are destined to the affected airport are held at their departure point for the duration of the Ground Stop.
- Head ID. The numeric identifier for the specified traffic management initiative (GDP, GS, etc). There may be several records (advisories) for a given head ID, specifying the initiation, modification, and cancellation of the TMI.
- Reroute. The number of Reroutes in effect for the specified date(s). Reroutes are initiated when ATC needs to move air traffic away from, or into, a particular area of airspace. Reroutes can be issued as either required, recommended, or "FYI". A specific application of reroutes is known as the Severe Weather Avoidance Plan (SWAP), which is a formalized program that is developed for areas susceptible to disruption in air traffic flows, caused by thunderstorms.