Which atmospheric layer do pilots primarily operate in near the Earth's surface?

• A. Stratosphere
• B. Exosphere
• C. Troposphere
• D. Mesosphere

Answer: (C)

The main concept is that the airspace pilots mostly work in is the troposphere. This layer sits right above the Earth's surface and contains most of the atmosphere’s mass, along with all weather, clouds, and the turbulence caused by rising and sinking air. Because of that, takeoffs, landings, and the bulk of day-to-day flight operations occur here. The temperature generally falls with increasing altitude in this layer, and it ends at the tropopause, where the stratosphere begins. The stratosphere lies above and is much less turbulent, and while some high-altitude flights may operate near its lower edge, near the surface it’s the troposphere that dominates pilot activity.