Commercial and long-distance airplanes usually fly in the lower stratosphere. By cruising at these higher altitudes, aircraft can stay above the turbulent weather and storms found in the troposphere. This results in a much smoother ride for passengers and allows the jet engines to operate more efficiently in the thin, cold and stable air of the upper atmosphere. ANSWER: (B) Stratosphere
Where do airplanes usually fly? (A) Troposphere (B) Stratosphere (C) Central Division (D) outer circle
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Most modern jet aircraft prefer to fly in the lower stratosphere, just above the tropopause. The primary reason is flight stability; because the stratosphere lacks the convective currents and moisture that cause storms, pilots can avoid the turbulence associated with weather systems. Additionally, the air in the stratosphere is less dense than the air at ground level, which reduces aerodynamic drag on the airplane. This allows jets to travel faster while consuming less fuel. Furthermore, the absence of clouds provides better visibility for navigation, making the stratosphere the most practical and economical zone for high-speed global travel.
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