Every Secret You've Ever Wanted to Know About Flying on a Plane

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What are those tiny holes on the windows?

Don't worry, these aren't bullet holes. These small holes are known as "bleed holes," and their purpose is to regulate the cabin's air pressure. Each window has three layers, including a small gap between the middle and outer layers. The bleed hole helps to rebalance the pressure between the cabin and the gap.

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Why do planes leave white lines in the sky?

The white lines that planes emit when traveling across the sky are called condensation trails, or contrails. Contrails occur when the plane's hot vapor meets the cool air in the atmosphere—similar to how we can see our breath in winter.

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The More You Know

  • Little brown bats sleep more than any other mammal on earth.
  • Sesame Street is now a real place.
  • Donkeys and dolphins are sometimes used as guard animals.
  • The moon has its own time zones.
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