The pilots of AF447 seemed to be ignorant of AoA.
Airbus considered that showing the AoA on the display was not useful.
Certification administrations accepted such equipped aircraft to be used for passengers public transport, not matter of AoA.
Air France buyed that aircraft without AoA display.
Pilot unions (SNPL SNPNAC SPAF UNAC, etc.) did never any strike to get AoA.
In other Countries it was the same.
ICAO did no global recommandation.
AESA accepted that mix of AoA ignorance.
WHY?
Many pilots knew enough physik before to get pilot (math sup or mor fo someone.
BUT : At the first page of any aerodynamics book for airline pilot you see the figure of a wing with airstreams thiner when passing over the wing : Well! And then it is written that these airstreams are independant (Bolzmann theory of gas). Question:How does the third airstream knows the wing is there to get thinner?
The pilot trainee decides then to forget definitively the logic and the physic laws!!! And in flying lessons it is said that good pilots are "stupid"...
NO NEED OF AOA!
Some aerobatics flights would SHOW him he is wrong. But it is the time for "NEW METHOD" (Thank you Monsieur DEBIESSE, who initiated that method in the French DGAC)
NO NEED OF AOA SENSORS!
Only a good theoric teaching can bring back confidence to physic reality.