Buying into this Suicidal discussion:
Further to jaguar Pilot:
'Super Critical' was designed by Airbus and is noticeable on the A330/340 wing (maybe 777 - not sure). This permitted some airflow over the wing to be supersonic without resulting in an unacceptable rise in Drag.
This results in a higher MCrit, resulting in a higher Mmo/Vmo
In the older generation T-tail Jets (B727/DC9) there was a Mach Tuck effect. At high Mach Nos the nose tended to pitch down, and nose-up pitch trim was introduced to compensate.
Not so noticeable on new generations.
While flight testing our B767 SIM at high Mach No, I have observed:
1. Initially Auto-throttle response to compensate (as per systems);
2. A Nose-up pressure (maybe aerodynamic or perhaps some nose-up stab trim) [perhaps someone from Boeing can enlighten me]