Depends on the return path. Where I live, we heard them about 50% of the time with the shuttle. Yesterday made me look out the window for the source of the big boom. If there were two booms, they were close enough to sound like one. I live in the center of Polk County.
Probably. When I lived in Daytona, every landing that came over, and that was most, was accompanied by a distinct boom-—boom. Always cool.