Now, back to what the "light" may be... I think that the light seen here is again a flaring Starlink satellite, and by checking on In-The-Sky.org at the time indicated (2022-08-18 07.19UTC) we can see that there were illuminated Starlink satellites in this exact region of the sky near Merak in the Big Dipper. I've taken the observer's lat long from the flight track kml as the plane flies close to Malibu.
I'm trying to reproduce this. I'm using stellarium and in-the-sky[dot]org and they are showing the big dipper in the same spot, and a seemingly same/similar number of Starlink satellites near and below the angular altitude of the star Merak. But the satellite labels are completely different.
in-the-sky shows STARLINK-4073 visible just to the right of Merak. Stellarium shows STARLINK-2700 or STARLINK-1272 in that location. (or maybe a different one, seconds make a big difference in satellite position and I don't know the coordinate precision of the satellite locations, so it might not be those exact satellites). Stellarium shows STARLINK-4073 being not anywhere close though. It's on like the other side of the world. Not just seconds of time away which maybe could be a rounding error or some imprecision by the application.
Am I doing something wrong? Are satellite labels consistent across databases? Am I tired and messing up my timezones? The lat/long and time on in-the-sky[dot]org and stellarium look the same to me.
(Big dipper view in Stellarium at location: 33.63ºN, 118.63ºW; time: 2022-08-18 00:19:15-07:00; matching in-the-sky image above)
(Stellarium's idea of where STARLINK-4073 is at 33.63ºN, 118.63ºW; time: 2022-08-18 00:19:15-07:00. Not close to big dipper)
If I fast forward, STARLINK-4073 actually does arrive at the location just to the right of Merak, NNW in the sky, roughly 39 minutes later, at 2022-08-18 00:58:15-07:00. (see below)
But by 00:58:15-07:00, the Sun is now offset ~+10º CW from Merak, and Stellarium thinks none of of the Starlink satellites around the Big Dipper are visible. (see below)