Which of the following is an Area Navigation (RNAV) route published for use in the United States?

The correct choice, which identifies an Area Navigation (RNAV) route published for use in the United States, is the Q route. Q routes are designed specifically for RNAV-equipped aircraft and are typically used above FL180 (18,000 feet). These routes comprise a network of waypoints that allow for more efficient flight paths and flexible routing, reflecting modern advancements in navigational technology.

This emphasis on efficiency and flexibility is a key aspect of RNAV operations, enabling direct paths between waypoints that might not align with traditional airways. As RNAV technology becomes increasingly prevalent, understanding the specific routes designated for this type of navigation becomes essential for effective air traffic management and safety.

In contrast, while V routes are traditional jet routes used for aircraft navigating via conventional navigation aids, S routes and T routes are more related to different types of visual or terminal area navigation rather than specifically RNAV operations.