The SR-71 flew at 85,000 feet in 1976, the highest ever.
2200 mph
Stratosphere
No it just flew very high to avoid radar.
What is SR71 auto insurance
The SR-71 Blackbird primarily operated in the stratosphere, which is the second major layer of Earth's atmosphere. This layer is characterized by high altitudes, low air pressure, and stable atmospheric conditions - ideal for high-speed, high-altitude flight capabilities of the SR-71.
The SR 71 was a very secret high speed, high altitude reconnaisance aircraft. Only 32 were built, at enormous cost.
SR71 Blackbird Model M-21: maximum speed: 2211miles/h Generally, the given answer for all models of the SR71 is: "In excess of Mach 3", or more than three times the speed of sound. see related links below for more info
Black
High
Boeing
3.5
2193 mph