Kind of by definition if something is -sonic then it's in the atmosphere. There would be less scattering but there would definitely be some on the target end.
Reentry does kind of by definition enter the hypersonic regime, but it's somewhat unintuitive to the layperson since Mach 5 is much slower at those very low pressures, and it's an entirely different beast than flying at Mach 5 in-atmosphere proper
The gliders seem to spend the entirety of their trip in the upper atmosphere, though.