Which ATC facility provides services to aircraft on IFR flight plans during the en route phase of flight?

The Area Control Center (ARTCC) is specifically designed to provide air traffic services to aircraft operating under Instrument Flight Rules (IFR) during the en route phase of flight. ARTCCs manage air traffic over large geographic areas and are responsible for coordinating aircraft movements, monitoring flight progress, and providing directional guidance to ensure that aircraft maintain safe distances from one another.

During this phase of flight, aircraft are typically cruising at higher altitudes and transitioning between various air traffic control sectors. The ARTCC handles these high-altitude flights by utilizing radar and other technologies to continuously track aircraft, ensuring efficient traffic flow and safety. This facility is essential for managing the complexities of IFR operations, particularly as numerous aircraft can be operating simultaneously across vast distances.

In contrast, Terminal Radar Approach Control facilities are more focused on managing air traffic during the arrival and departure phases at airports, not during the en route phase. Control towers are responsible for operations directly related to takeoff and landing at airports, while Flight Service Stations primarily provide information and assistance to pilots, such as weather briefings and flight planning support, rather than direct air traffic control services during en route flight.