LiveATC(LAX) + Live KLAX WebCam is a gas(yeah, I'm old).
...but only when they point it at the North/South complex runways...which they occasionally do during the day(unfortunately mostly pointed at the terminal entrance).
That's about as close to live plane-spotting as you can get, without actually being there.
Did a lot of spotting north of the 24 complex years ago, also near the south complex on the approach end.
...bet those days are long gone(post 911).