Halo & Contrail by Taavi Babcock of British Columbia, Canada.�Taavi Babcock, shown with permission.
Most contrails are higher than the layer of cirrus haze that makes halos. The contrail shadow can often be seen cast downwards onto the lower layer.

Here it is less easy to see whether the contrail is higher, lower or at the same level as the cirrus haze.

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Contrails, shadows & jet engines