Fullwings, when I was talking about "prolonged" updraft I was referring to the type of event(-s) Gybreght is referring to in his post.
I was perhaps not that clear (laying by the pool as I'm writing
) but there will eventually decrease in airspeed as you gain altitude with the updraft and with increased altitude, close to normal/max cruise altitudes, the stall speed will also increase.
As mentioned already by tubby universal laws of aerodynamics apply also to the Airbus and it WILL stall if the meteological forces at work are strong enough. I have been shot down here before for trying to tell people that the Airbus can and will stall given the "right", wrong, circumstances.