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

  • There is a fish with transparent bones and white blood.
  • Muhammad is the most popular name in the world.
  • During World War 2, a bear named Wotjek joined the Polish army. He carried ammunition and occasionally drank beer.
  • Arkansas hosts the annual World Championship Duck Calling Contest.
Next Page →