Stratosphere
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.
2200 mph
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
birds fly in the troposphere which is the lowest layer of the atmosphere.
Airplanes Fly in the layer of the atmosphere called Troposphere
stratosphere
stratosphere
stratosphere
The Boeing 747 can fly in the troposphere and lower stratosphere layers of Earth's atmosphere.
Jets fly through the stratosphere, which is the second layer of the Earth's atmosphere. The stratosphere contains the ozone layer, which helps to absorb and block harmful ultraviolet radiation from the sun.
Birds typically fly in the troposphere, which is the layer of Earth's atmosphere closest to the surface. This layer extends up to about 7-17 kilometers above sea level, depending on the region.
They Fly In the Stratosphere. The Stratosphere is the 2 Major Atmosphere