Atmosphere of the earth is made up of different spheres. in which part of atmosphere commercial air craft usually fly:

زمین کا ماحول مختلف شعبوں سے بنا ہے۔ فضا کے کس حصے میں کمرشل ہوائی جہاز عموماً اڑتے ہیں
Answer: Stratosphere
Explanation

The atmosphere is comprised of layers based on temperature. These layers are the

troposphere

stratosphere

mesosphere 

thermosphere

A further region at about 500 km above the Earth's surface is called the exosphere.

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