What is the minimum radar separation required for aircraft flying at or above FL 600?

The minimum radar separation required for aircraft flying at or above Flight Level 600 is 10 miles. This standard is established to ensure safe and effective separation between aircraft operating at such high altitudes, where factors such as speed and potential turbulence are significant.

At flight levels above 600, the increased airspeed and aircraft capabilities necessitate a greater separation distance compared to lower altitudes. This helps to account for the performance characteristics of aircraft flying at these altitudes, reducing the risk of proximity and collision. Therefore, the correct answer reflects established aviation safety protocols to maintain safe operations in higher airspace.