[plsvn]

Moose4:

I don't think there's enough density at 207,000 feet to make a noise that you'd hear on the ground.

I saw the Shuttle re-entry that brought Dr. Shannon Lucid home from her stay on Mir. I viewed this from Calgary, Alberta, and the Shuttle was higher than 200,000 at that time. There was a sonic boom, a faint one, but one nevertheless.