Can an aircraft stall occur at any airspeed?

An aircraft can stall at any airspeed as long as the angle of attack exceeds the critical angle of attack. The stall point is primarily determined by the relationship between the wing's angle of attack and the airflow over it, rather than by airspeed alone. When the angle of attack increases beyond a certain point, the smooth airflow over the wing begins to separate, leading to a loss of lift regardless of the aircraft's speed. This means that a stall can occur at various speeds, including high speeds, provided the critical angle of attack is exceeded.

The concept of stall being tied to angle of attack is fundamental to understanding flight dynamics and emphasizes that pilots should closely monitor their angle of attack in conjunction with airspeed during flight rather than relying solely on airspeed as an indicator of stall risk.