We had such nice weather last week and a few of the days were almost cloud-free. Well, they were cloud-free except for some clouds that formed behind airplanes.
On a few of those days, we saw airplanes and a trail that was being left behind them. These planes flew all around the Alleghenies and some people called in to our newsroom asking what they are spraying. To clear things up, let me explain what contrails are.
Basically, the contrail is a trail of condensation that occurs behind an airplane.