Skip to page content

Separation Management

Separation Management improvements will enhance aircraft separation assurance by safely reducing separation between aircraft. Capabilities in this portfolio will provide air traffic controllers with tools and procedures to separate aircraft in a mixed environment with various types of navigation equipment and wake performance capabilities.


  • Access

    Provides an operating environment ensuring all airspace users have right of access to the air traffic management resources they need to meet their specific operational requirements, and the shared use of airspace by different users can be achieved safely. The global air traffic management system should ensure equity for all users that have access to a given airspace or service.

  • Capacity

    Takes advantage of the inherent capacity to meet airspace user demands at peak times and locations while minimizing restrictions on traffic flow. To respond to future growth, capacity must increase, along with corresponding increases in efficiency, flexibility, and predictability, while ensuring that there are no adverse impacts on safety and giving due consideration to the environment. The air traffic management system must be resilient to service disruption and the resulting temporary loss of capacity.

  • Efficiency

    Addresses the operational and economic cost-effectiveness of gate-to-gate flight operations from a single-flight perspective. In all phases of flight, airspace users want to depart and arrive at the times they select, and fly the trajectories they determine to be optimum.

  • Safety

    Uniform safety standards along with risk and safety management practices should be applied systematically to the air transportation system. In implementing elements of the system, safety needs to be assessed against proper criteria, and according to appropriate and globally standardized safety management processes and practices.

Implemented Capabilities and Locations

Facility Code Definitions

NextGen Implementation Plan (PDF)

  • Automated Terminal Proximity Alert (ATPA) for In Trail Separation

    Information as of November 30, 2017

  • Automatic Dependent Surveillance—Broadcast (ADS-B) Oceanic In-Trail Procedure (ITP) and Automation
    • ZOA; ZAN; ZNY

    Information as of November 30, 2017

  • Automatic Dependent Surveillance—Contract (ADS-C) Oceanic Climb/Descent Procedure (CDP)
    • ZOA

    Information as of November 30, 2017

  • Enhanced Oceanic Climb/Descent Procedure (CDP) via ADS-C Automation
    • ZOA; ZAN; ZNY

    Information as of November 30, 2017

  • Wake Re-Categorization (Wake Recat) Phase 1 - Aircraft Re-Categorization
    • A11 (ANC); A80 (ATL); C90 (MDW, ORD); CLT; CVG; D01 (DEN); I90 (IAH, HOU); IND; M03 (MEM); N90 (EWR, HPN, ISP, JFK, LGA, TEB); NCT (SFO, OAK, RNO, SJC, SMF); SDF

    Information as of November 30, 2017

  • Wake Re-Categorization (Wake Recat) Phase 2 - Static, Pairwise Wake Separation Standards

    Information as of November 30, 2017

Page last modified:

This page was originally published at: