Passenger Planes: Why do passenger planes fly only at a height of 12 kilometers from the ground, what is the science behind it?

Passenger Planes: Why do passenger planes fly only at a height of 12 kilometers from the ground, what is the science behind it?

Today, to save time, most people prefer to travel by flight. Because with this, long distance journeys can be completed in less time. But do you know at what height above the earth the flight in which you travel flies? After all, why does a flight fly only at a fixed altitude, what is the reason behind it?   How many flights every day According to the Ministry of Civil Aviation, more than 6000 flights fly in the sky every day in India. Which includes 3061 departure flights and 3058…

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