Final answer:
Airplanes reach the stratosphere layer of the atmosphere due to stable air conditions and increasing temperatures with altitude.
Explanation:
The layer of the atmosphere that airplanes reach is the stratosphere. This layer extends from 12 to 50 km above the Earth's surface, with the ozone layer present within it. Airplanes fly in the stratosphere due to stable air conditions and increasing temperatures with altitude.
Learn more about Atmospheric Layers here:
https://brainly.com/question/29760640
