Multiple choice

Commercial airplanes fly in the _______.

  1. exosphere

  2. thermosphere

  3. stratosphere

  4. troposphere

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Commercial jet airliners typically cruise in the lower stratosphere, usually between 31,000 and 38,000 feet, to avoid the turbulent weather of the troposphere and benefit from stable air and fuel efficiency.