What lateral separation is required for nonparticipating aircraft flying at FL600 and above?

The required lateral separation for nonparticipating aircraft flying at Flight Level 600 (FL600) and above is indeed 6 miles. This separation distance is critical for maintaining safe distances between aircraft operating at such high altitudes, where the potential for wake turbulence and other factors can affect safety.

At FL600 and above, airspace is primarily utilized by high-performance aircraft which might not be monitored in the same way as lower altitude traffic. Therefore, to ensure safe operation, the standard lateral separation increases compared to aircraft operating at lower altitudes. The 6-mile requirement provides an adequate buffer to prevent possible conflicts and ensures that aircraft can operate safely without interference from others in close proximity. This standard is consistent with guidelines set by aviation regulatory bodies for high-altitude operations.