Stratosphere
the stratosphere!
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 is the second layer of atmosphere it is the layer where the aeroplanes can fly
stratosphere
troposphere!
troposphere
The stratosphere
stratosphere
stratosphere