What was the fastest plane a man has flown?

Without a doubt, the SR-71A Blackbird (decommissioned). It is able to reach speeds around 3.3 mach (1 mach is the speed of sound) in level flight, and it is said that one achieved 5.5 mach. Under what circumstances, I do not know, but I suspect it was coming out of a dive from the edge of space, 90,000 to 100,000 feet.