This post in the Cloud Appreciation Society at around 7:20AM on March 5, 2020 led to some jokes (and genuine speculation) about chemtrails, geoengineering, or weather manipulation. The post was quickly deleted, as the Cloud Appreciation folk don't really appreciate chemtrail talk.
So I had a quick look at FlightRadar24 and found several planes had been delayed landing into San Diego, and had been put into holding patterns at high altitude.
Some noticing on twitter too:
His flight was probably SWA717, which was actually holding at 34,000 feet over anaheim