Who is responsible for maintaining separation between IFR flights while enroute?

• A. FAA
• B. ATC
• C. ARTCC
• D. TRACON

Answer: (C)

Maintaining separation for IFR flights while they are en route is handled by the Air Route Traffic Control Center, the facility that manages high- and mid-altitude airspace along the airways. Controllers in these centers monitor positions, issue clearances, and enforce the required horizontal and vertical separation between IFR aircraft as they travel long distances between airports. They rely on radar and position reports, and they coordinate with neighboring centers to keep separation consistent as flights cross boundaries. In areas with limited radar, separation is maintained procedurally using time and distance data from position reports and speeds. The FAA oversees the system, but the enroute separation responsibility specifically lies with the ARTCCs. Terminal operations near airports are managed by TRACONs, not en route centers.