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Angle of attack is not a specific angle but a term used to describe the angle between the wing's chord and the apparent wind. The wings chord is the imaginary straight line joining the leading and trailing edges of an airfoil. Apparent wind is the air motion relative to the direction that the aircraft is currently moving in. The amount of lift generated by a wing is directly related to the angle of attack, with greater angles generating more lift to a point. The stall point is an angle at which lift begins to decrease again. This is also not a specific angle.