NextGen is an umbrella term for the ongoing transformation of the National Airspace System (NAS). At its most basic level, NextGen represents an evolution from a ground-based system of air traffic control to a satellite-based system of air traffic management.
NextGen is transforming the National Airspace System (NAS) through a number of operational improvements. Each improvement is implemented through a series of capabilities, or increments, that provide individual benefits and combine to provide a transformative change in the way we operate the NAS. Related operational improvements are grouped in eight NextGen implementation portfolios and three supporting portfolios that address infrastructure, safety, and environmental and energy needs.
An interactive map of NextGen implementation technologies can be found here.