Preferred IFR routes serve what purpose?

• A. Limit IFR routes to a single corridor.
• B. Increase system efficiency and capacity.
• C. Exclude weather avoidance procedures.
• D. Be used only during daylight operations.

Answer: (B)

Preferred IFR routes are designed to increase efficiency and capacity in the airspace by providing standardized, optimized paths for en route traffic. When pilots follow these routes, traffic flows more predictably, sequencing for arrivals and departures is smoother, and airspace and navigation resources are used more effectively. This reduces unnecessary vectoring and holds, lowers workload for controllers, and can cut flight time and fuel burn. The routes also help manage weather by offering approved paths that accommodate deviations without breaking the overall flow. They aren’t meant to confine you to a single corridor, aren’t about excluding weather avoidance, and aren’t limited to daylight operations.