Which of the following is NOT one of the nine identification features of an aircraft?

The identification features of an aircraft are crucial for air traffic control and safety. Among the nine standard features, attributes such as engine number, windows, and wing configuration are used to establish and verify an aircraft’s identity.

Engine numbers are unique identifiers assigned to each engine, aiding in maintenance tracking and identification of specific aircraft models. Windows, especially the number and placement, can signify certain aircraft types and configurations. Wing configuration, including the design and shape of the wings, is another distinguishing feature that helps categorize aircraft.

Fuselage color, while it can be helpful in visual identification under certain conditions, is not a standard identification feature used for the systematic identification of aircraft types in air traffic control. Colors can vary widely across airlines and individual aircraft, creating inconsistencies in identification. Therefore, fuselage color is not listed among the essential identification features that ATC relies on to ensure compliance and safety operations in airspace management.