Non-experts define contrails as condensation trails that form due to the steam left behind by aircraft and which take shape ...

The water vapor from the hot plane engine turns to ice mid-air which we see as white lines in the sky called contrails. This is the same phenomenon we see when we breathe hot air on a cold day.

Gaze up at the sky on any clear day and you'll likely see it streaked with the white lines left behind from jets as they pass overhead on their way to destinations all over the world. Sometimes ...

Most of us first spot them as children—the white lines in the blue sky that are the telltale sign of a flight overhead. Contrails are an instant visual reminder of air travel, and a source of much ...