Seeing white streaks across the sky emanating from a jet is normal. These are known as "contrails," since they're just, as the name implies, trails of condensation.

These streaks are called contrails, short for condensation trails. They are man-made clouds, formed by jets flying at altitudes of 30,000 to 40,000 feet, where temperatures can drop as low as -25 ...

We’ve all seen those white streaks trailing behind jets, creating stripes against the blue sky. The lines are called contrails, short for condensation trails, and they appear when water vapor ...

The image is of the morning sky over London one hot day in June. Why do the contrails end so evenly and abruptly? David Muir Edinburgh, UK Condensation trails, or contrails, are formed when the ...

An April 16 Instagram video (direct link, archived link) shows different cloud formations and airplane condensation trails. “Geoengineering,” reads text in the video. “Watch the blue sky and ...

Treasure Coast residents awoke Monday to find a series of mysterious, milky streaks across the sky. The contrails, or condensation trails, streamed in parallel lines toward the horizon as they ...

Seeing white streaks across the sky emanating from a jet is normal. These are known as "contrails," since they're just, as the name implies, trails of condensation.