What term refers to aircraft that are considered friendly?

The correct term referring to aircraft that are considered friendly is "TALLY." In military aviation and air operations, "TALLY" indicates that a crew or pilot has visually identified a friendly aircraft. This recognition is crucial for situational awareness and helps in avoiding friendly fire incidents during operations.

The other terms do not convey the same meaning. While "Chicks" might be used informally in some contexts, it does not have the formal recognition associated with identifying friendly aircraft. "HITS" typically refers to successful engagements or impacts on targets, while "TRACKING" pertains to monitoring or following the movement of an aircraft, which does not specifically denote whether the aircraft is friendly or hostile.