Dogfights Over England

When aircraft fly through high elevations, they leave trails of condensed moisture known as "contrails."  We have all seen them streaming out of the back of an airliner in the traditional straight line.  Imagine what the sky would look like if the airplane flew in circles, and then add hundreds of aircraft to the sky.  The result would look like the air over Britain during World War II.  How To Be A Retronaut posted a series of photos showing the dizzying patterns formed by contrails as Allied and German fighters fought over the UK.