Given the expense and size of airliners, it might be worth determining AoA via tracking minute dust particles with LIDAR. That should be highly reliable, with v

Given the expense and size of airliners, it might be worth determining AoA via tracking minute dust particles with LIDAR. That should be highly reliable, with very direct speed measurement in airflow that isn't in any way disturbed by the aircraft. You also get airspeed. Maybe there is an alternative to AoA. The whole point is to determine how air will be affecting surfaces such as the wing, so one could instead just put pressure transducers all over the aircraft. From that you can determine how close you are to stalling. You can even tell where on the aircraft a stall is imminent.