@dims
I am not sure where you are getting this "critical angle of attack" term from.
I highly recommend a visit to the library and see some books. Of course, Wiki is likely to have good stuff on aero or some links.
You can "stall" at damned near any speed, gross weight, gee, bank angle - there must be "fifty ways". It all comes down to one thing - AoA. The classic graphic of AoA and Cl seems out dated to this old fart. The older, straight wing and large camber wings behave like that. The swept wings and airfoils since the 60's do not. You can fly well beyond the peak of the Cl point on the graph and not "stall". On some planes ( like deltas - think Concorde), you never lose a lotta roll authority or directional authority, but develop a high sink rate. Call it stall, but simply lowering the nose will regain "normal" flying characteristics real quick.
Go to the library and then come back.