What informs pilots of potential traffic conflicts in the air?

The correct choice identifies "Traffic Advisories" as the primary means by which pilots are informed of potential traffic conflicts in the air. Traffic Advisories are issued by air traffic control (ATC) and are designed to enhance situational awareness by providing real-time updates regarding other aircraft near the pilot's flight path. These advisories help pilots to maintain safe distances from potential conflicts, ensuring effective collision avoidance.

In busy airspace, timely information on the location and movement of other aircraft is crucial for safety. Traffic Advisories can include details about the relative altitude, direction, and distance of nearby traffic, which assists pilots in making informed decisions and maintaining safe operations.

Other options like Traffic Resolution Advisories, while also providing information about aircraft, are typically more specific to resolving a conflict rather than notifying about potential conflicts, which might occur later. Flight Plan notifications focus more on the filed route and planned maneuvers rather than immediate, real-time traffic status. Ground Control instructions relate to airport ground operations and are not applicable to airborne traffic situations.