Hi all, I started to noticed that the upper level SAT temperatures in FS9 varied slightly to those being displayed in the winds aloft pane of AS6.5. To find out of there was a particular trend, I collected upper wind data from four different airports (KLAX, KORD, SBGL and FACT) and compared the wind data in FS9 to that being downloaded from AS6.5. For each level (FL030, FL060, FL090, FL120, FL180 and FL240), the temperature in FS9 was between -3.5 and -4.5*C cooler than AS6.5. In total I have 24 data points and they all display the same difference. To me this indicates that the difference is not random. Has anybody else come across this and can explain what is going on and how to fix it. I have 100% accuracy for upper wind set in AS6.5 too. Cheers. David.