EnRoute Traffic Analysis

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.