Cabin Crew Reveals What Really Happens When Flying

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.

Advertisement

Next Page →

The More You Know

  • Arkansas hosts the annual World Championship Duck Calling Contest.
  • The world's oldest operating library is in Morocco.
  • A man sued Pepsi claiming he found a mouse in his Mountain Dew. Pepsi attorneys stated that Mountain Dew will dissolve a mouse in 30 days, and showed his can was purchased 74 days after being manufactured.
  • For every human on Earth, there are 1.6 million ants.
Next Page →