Continues Wheeled material that shows how contrails are known - and photographed - a long time. Another documented example and 'an article dating back to 1974 , dedicated to the analysis of a series of observed contrails in the skies of America; complete reference: TG Konrad, JC Howard, "Multiple Contrail Streamers Observed by Radar", Journal of Applied Meteorology, vol. 13, 563-572, 1974 .
Without discussing the article, reporting directly to a series of photos in it (with captions):
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