In planning, which factor must be considered along with aircraft performance, wake turbulence, closure rate, known weather conditions, and aircraft position to maintain separation after applying visual separation?

• A. Altitude
• B. Ground speed
• C. Routes of flight
• D. Pilot workload

Answer: (C)

When you apply visual separation, you’re not just looking at where the aircraft are now—you have to think about where they will be as they continue their flights. The routes of flight tell you the intended paths, including any turns, speed changes, or diversions the aircraft may execute. This information is crucial to predict future positions and ensure the separation you’ve established remains intact as the aircraft proceed along their routes. Even if current performance, wake turbulence, closure rate, weather, and position are accounted for, a change or difference in the planned routes can bring the aircraft closer together or cause a crossing conflict. Knowing the routes lets you anticipate these possibilities and adjust or reaffirm separation accordingly.

Ground speed is already part of how you assess closure rate, so it doesn’t add new information. Altitude relates to vertical separation rather than the planned horizontal path. Pilot workload, while relevant to overall safety, isn’t the factor you rely on for maintaining separation in the planning sense described.