Agree with daggets,

Even tough an airplane is flying in the subsonic or transonic speeds, the airflow over the wing might be supersonic, that's why the supercritical airfoils were developed, those are the ones with less curvature on top and complex curvature on the bottom, those, can be seen in any corporate jet capable of high subsonic speeds or airliners.

It is not possible at the moment to suffer from that effect on model airplanes, but lots of people think high speed stall is when you come really fast and at the pull of the elevator the model snaps as the tip stalls progress, but that is associated with the abrupt increase in the AOA, whether the real high speed stall is produced with no AOA change.

Regards