If two aircraft are on radials diverging by less than 15 degrees, what is their separation status?

When two aircraft are on radials that diverge by less than 15 degrees, they are not considered separated according to air traffic control standards. For active separation in an en-route environment, aircraft must maintain a distance that ensures safety, which typically entails being on radials with a divergence of at least 15 degrees or more. This degree of divergence is crucial because insufficient divergence means that the aircraft could potentially enter the same airspace or become conflicted, leading to safety risks. Thus, without the required angular separation, the aircraft are classified as not having proper separation, indicating a need for immediate corrective measures if they are to be safely managed.