Actually a key finding in AF447 was that pilots were not trained on how to recognize and recover from a high altitude stall. It is not like flying a Cessna 150. The junior first officer didn't realize the aircraft had stalled.

Pilots were trained on the procedure for recovering from a low altitude stall; 100% or TOGA thrust and power out of it while minimizing altitude loss. Training has now changed for both low altitude and high altitude stall recovery.