Where are these controllers located?
has a small control tower over their terminal. I believe that is where their ramp controllers work. AA
ramp control is a room overlooking the C-10 alley. Not sure about others.
Do aircraft parked at the end of the terminal still contact ramp for push or do they contact ground instead?
Ground Control if you're going to move anywhere on the taxiways. AA
specifically lists the gates that need to call LAX
Do ramp and ground communicate?
Not really. If LAX
controllers have the time they usually keep an eye on what gates are open in areas that have their own ramp control, but often they'll just give you initial taxi instructions to clear their runway exits and to call them back when you (aircraft) find out your gate's status.
Finally, does anyone know ramp frequencies for AA, DL and/or UA?
Jepp. page 10-9B has ramp freqs listed, but I don't have my pubs with me at the moment.