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24-Nov-2017 02:52

These trails are actually called contrails, short for “condensation trails”.They are not smoke from the engines, they are formed when the water in jet exhaust (and there’s quite a lot of it, like car exhaust on a cold day) mixes with wet cold air, and condenses and freezes into ice crystals. When the air is wet and cold enough the trails can stay around for a long time, and sometimes spread out. Contrails can fade away, and contrails can persist and spread. Now there are two main reasons why some planes leave trails and some nearby planes do not.But actually the JAL plane (a B777) is at least 1000 feet above the DHL plane (an A300).And look at some planes on the ground, where we know they are all the same distance from the camera.You can also get a similar effect with engines at different power settings, especially if it affects the exhaust temperature. This was very neatly illustrated by the recent launch of the Solar Dynamics Observatory.

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Especially as this is more zoomed in than you’d see with the naked eye, which would be more like: If the planes are flying lower, then it’s still similar.