Which is true regarding STARs?

STARs, or Standard Terminal Arrival Routes, are designed to facilitate the transition between en route air traffic and instrument approach procedures. This is a critical function, as they help aircraft efficiently navigate from the high altitude en route phase of flight down to the lower altitudes where they will enter terminal airspace and approach an airport. By using STARs, air traffic controllers can manage air traffic flow more effectively and enhance safety by providing standardized routes that help prevent conflicts with other aircraft during arrivals.

In contrast, the other choices highlight inaccuracies about the nature and purpose of STARs. For instance, while they can aid in managing IFR and VFR traffic, they are not exclusively for that separation, nor are they limited to peak traffic hours at airports. Additionally, STARs are applicable for both domestic and international flights, making their use broader than just international operations. Thus, understanding that the primary role of STARs is to connect the en route phase of flight to the approach phase helps underscore their importance in aviation operations.