How Fast is Mach 3.2 Really!

The North American X-15 holds the title for the fastest jet-powered aircraft. It reached a record speed of Mach 6.7 (4,520 miles per hour or 7,273 kilometers per hour) during a test flight in 1967. However, the X-15 was a rocket-powered aircraft and not a traditional jet​
SR-71 BLACKBIRD
If we focus strictly on operational military jets, the SR-71 Blackbird is the fastest. It achieved speeds of Mach 3.2 (approximately 2,455 km/h or 1,525 mph) during its reconnaissance missions. Unlike the X-15, the SR-71 was actively used for military operations