a jet swirling contrails

San Francisco, 2015.04.19

As we came over the last range of mountains I spotted another plane coming from the south (left). It was running along the range of mountains about 50m above the clouds, spinning two contrails that swirled in its wake. We passed within about 300m of each other, at different altitudes. It was all over in about twenty seconds; startling but beautiful.

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