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Stall Warning Horns

Boeing defines angle of attack as the angle between the velocity vector and the longitudinal fuselage datum. Most, if not all, transport aircraft measure body angle of attack using alpha vanes mounted forward on the sides of the fuselage.

https://www.boeing.com/commercial/aeromagazine/aero_12/aoa.pdf

https://www.boldmethod.com/blog/2013/10/how-does-lowering-flaps-affect-angle-of-attack/

When discussing angle of attack perhaps one should define what is being measured and to what it is being referenced.
 
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