I am a fan of flying commercial jets in FS9, but I have noticed that for the most part the speeds attained by FS9 jets fall way short of their performance limits. For example, an SST has a maximum operating cruising speed of 1350, mph but the FS9 SST will overstress at 450 mph. A Boeing 747-300 has a Max speed (with CF6-80s) of 996km/h. Is there a conversion factor I don't know about. Why am I in such an overspeed situation at such low speed thresholds?