I am going to assume that you are joking.
However, if you aren't then I certainly hope that you are not in a profession that requires math, physics, one of the other sciences or, for that matter, in any profession that requires the use of logic.
Using your logic, then satellites in low-earth orbit traveling @ 18K/hr are standing still since sound cannot travel in a vacuum. Their speed would be zero to infinity. Likewise, those satellites in high-earth orbit which are traveling at a substantially higher speed are also standing still for the same reason.
I certainly hope and pray that you are joking.....for your sake.....not for mine. :-)
Well i knew alitude had an effect but I did not know it was so great, did you see the web page that I posted? there is a huge variance in mph from sea level to 30,000ft ! I thought there might be 5-15mph difference but... wow... No, I am not a scientist by any stretch, but I quickly did recover the bad information that I posted and fixed it...
From The Drudge Report, i read that it hit Mach 9.7 that would translate to 6,528.1mph...