When are controllers allowed to clear under overlapping holding patterns?

Answer: C — Never under FAA regulations

Under FAA regulations, controllers are not allowed to clear aircraft to hold in overlapping holding patterns at any time. This is due to safety concerns regarding the potential for collisions and conflicting flight paths that could arise if two aircraft were to occupy overlapping airspace simultaneously. Keeping holding patterns separate ensures that each aircraft has a defined and safe area to maneuver, minimizing the risk of a mid-air incident. The prohibition on overlapping holding patterns is put in place to maintain clear separation between aircraft, which is a fundamental principle in ensuring the safety and efficiency of air traffic management. Controllers are trained to recognize the potential hazards associated with overlapping patterns and to use alternative procedures to ensure safe operations, which is why this answer is the most accurate.