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En Route Traffic Analysis (ERTA)
The ERTA is an interactive analysis pursued by the FAA AJE-13 En Route and Oceanic Services to assess the en route traffic flow performance
and its impact on the end-to-end routing of aircraft from departure to arrival using AwSim™, with new customized modules and processes for this purpose.
One of these modules is the IPA Trajectory Set Library (TSL), which is a data repository designed to capture
and archive aircraft trajectories using ETMS data. The TSL performs post-processing analysis on archived
trajectories to extract key metrics which are incorporated in the original trajectory headers and generates
a global trajectory attribute (GTA) table. The FAA anticipates that the pre-conditioning of
the trajectories facilitates the analyses of air traffic flow, air traffic performance and air traffic time
versus spatial constraints.
This analysis capability is being used to perform statistical airspace assessment of the spatial characteristics of en
route regions of airspace over a defined incremental evaluation time interval, given a mixed flow of either RNAV
versus non-RNAV aircraft or certified versus non-certified DRVSM aircraft. These analyses contributes to the
empirical studies of the likelihood that a time savings is realized at the point of arrivals for ‘directs’ given en route.
En route directs are generally requested by pilots to save time. Furthermore, the Integrated Performance Analysis
defines the en route structure as the NAS air traffic backbone that effectively connects one Terminal Control
Area (TCA), servicing departures, with another TCA, servicing arrivals. This was used to perform the EPA (End-to-End Performance
Assessment) to determine the departure, arrival and en route transit times using a set of trajectories covering
a defined period of time.
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