Here is a good source to see what to expect for high altitude winds.http://squall.sfsu.edu/crws/jetstream.htmlThe real world weather for FS9 corresponds with this quite well. I had a ground speed over 600knots at mach .80 going from KORD to KJFK yesterday. Expect a long flight when traveling westbound over the eastern US today.Bob

Here is another one:http://adds.aviationweather.noaa.gov/winds/