What describes the angle of incidence in aviation?

The angle of incidence in aviation refers to the angle formed between the chord line of the aircraft's wing (or aerofoil) and the longitudinal datum, which is an imaginary line running down the length of the aircraft. This angle is a crucial element in aerodynamics as it directly influences the airflow over the wing and subsequently impacts the lift generated during flight.

When the angle of incidence is set appropriately, it optimizes the wing's performance at various flight speeds and conditions. This angle remains fixed during flight and is typically designed into the aircraft's structure. Therefore, option A accurately describes the angle of incidence in this context, emphasizing its aerodynamic significance related to the wing's design and function in the overall performance of the aircraft.