Definition
AIRBORNE REROUTE (ABRR)
A capability within the Traffic Flow Management System used for the timely development and implementation of tactical reroutes for airborne aircraft. This capability defines a set of aircraft-specific reroutes that address a certain traffic flow problem and then electronically transmits them to En Route Automation Modernization (ERAM) for execution by the appropriate sector controllers.
Source: FAA Pilot/Controller Glossary (verbatim from the Federal Aviation Regulations).