Contrails in the image, including the one immediately behind the jet, and the older one it crosses, develop waves as the airflow through the wave clouds carry them up and down. Northeast of Laramie, Wyoming. November 16, 2018 10:00 am MST.
A vapour trail in the dawn sky over Guildford. Left by an early morning flight on its way to Melbourne Airport (Tullamarine) 82 km to the south east. Taken this morning (15 October, 2017) at Guildford, Victoria, Australia.