It looks like a 737. Took place on July 14, 2020 at 4:00 PM in Long Beach, California.
The position of the sun's reflection on the fuselage nose shows that it is positioned very low – a clear indication of an Embraer type. The lower wing sweep and the long tailcone also indicate as much and are a clear indication against a larger twin like the Boeing 737 or the A320.
This leaves the E 179, 175, 190 or 195 as possible candidates. The 190/195 have a stretched fuselage and to me fit the one in the picture better.
So I guess this is an Embraer 190 or 195. Both are very similar, so I am not able to narrow this down more.
Embraer 175 from below (picture source). I could not locate more than side views of the E 190, so an E 175 has to suffice here.