Which statement about STARs is most accurate?

The statement that STARs facilitate the transition between en route and approach procedures is accurate because Standard Terminal Arrival Routes (STARs) are specifically designed to help aircraft transition smoothly from the en route phase of flight to the approach phase for landing at airports. STARs provide a structured and predictable path for aircraft as they approach an airport, which helps air traffic controllers manage the flow of incoming traffic more effectively. By following a STAR, pilots can expect a designated route with predetermined waypoints, altitudes, and speeds, thus simplifying the alignment with the airport's air traffic control procedures.

This systematic approach allows for easier navigation and ensures proper spacing between aircraft, ultimately contributing to safety and efficiency in terminal airspace operations. The use of STARs reduces the variability in flight paths, thereby improving the overall efficiency of air traffic management.