They're a perfectly natural cloud formation. Here's a photo of Altocumulus undulatus in the first International Cloud Atlas, published in Paris in 1896 - before planes ever took to the skies.https://flashbak.com/how-to-recognise-clouds-the-international-cloud-atlas-1896-437963/
In Album: Roger's Timeline Photos
Dimension:
700 x 700
File Size:
37.86 Kb
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