Source: https://www.youtube.com/watch?v=V6A-Cw8jVBk
I looked up earlier today, and I noticed these really unusual contrails. There were curves, and circles, with trails going horizon to horizon. It was very impressive, and I'm sure the chemtrail folk were thinking the worst.
So, I immediately hopped on FlightRadar24 to try to figure out what was going on. I quickly narrowed it down to Alaskan flight 2862 from Everett in Washington to Los Angeles. For some reason it flew a couple of 360s over Sacramento.
But that wasn't all. I zoomed out a bit to make an animation of this happened, and I was rather surprised to see there were SCORES of planes in holding patterns, all of them heading for LAX, and a lot of them at high altitude.
I contacted an ATC friend, and he told me that LAX had a "ground stop" because they were socked in with fog. This lasted around 30-45 minutes, and then everyone continued.
I then hopped on the GOES-17 viewer and looked at the playback. Sure enough, there was my contrail. It's not actually visible where it formed, as it's too thin. But as it drifted and spread you could see it from space.