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.

Many times, it is easy to trace a flight’s path in the sky, thanks to the wispy white lines that a plane leaves in its route, ...

Two French military planes have crashed in mid-air over the Saint-Dizier airbase - Patrouille de France is a French Air Force ...

NEW JERSEY - Is it a drone, a plane or a helicopter in the sky? Experts who study unmanned ... Many will also have flashing white strobe lights at their wingtips. And they have bright landing ...

Have you got a sharp eye? Put your vision to the test by trying this puzzle, which asks you to spot the plane in the sky. As aircraft tend to be huge, you shouldn't think it would be that difficult.

Legends of the Sky: The Liberty Plane is available to stream on pbs.org and the free PBS App, available on iPhone, Apple TV, Android TV, Android smartphones, Amazon Fire TV, Amazon Fire Tablet ...