We asked a pilot to explain how high planes fly and why they need to maintain cruising altitude. Here's what he had to say.

One recent day, I walked to my perch and watched a plane make its way west ... Some people enjoy watching clouds, but I prefer contrails, those chalky lines left in the wake of aircraft at ...

What are those long, white clouds a plane leaves behind ... a camouflage effect that shields the plane. That, combined with stealth technologies, could make an aircraft invisible to radar.

Planes or drones inject particles into the ... “The whole idea is not ‘creating clouds’ – because we cannot make a cloud, we cannot chase away a cloud,” Bruintjes said.