How far away should an FLT stay when following another FLT?

A Flight Level Transition (FLT) should maintain a safe distance of at least 1,000 feet vertically and 3 to 5 nautical miles laterally when following another aircraft. This distance helps ensure safe separation and avoids wake turbulence. The exact distance may vary based on the specific air traffic control guidelines and circumstances. Always adhere to the regulations and recommendations provided by air traffic control.