Originally Posted by Humshee
If I don't like that airline's lounge, can I use another oneworld lounge in the same terminal?
Probably not. The airlines don't in practice generally allow passengers on partner airlines use their lounges -- even if you have top-tier OneWorld status (Emerald).
I've tried a number of times and have and been denied access by BA, EI, and CX at a variety of airports.
However, if the lounge is empty and the attendant is friendly, you may be able to talk your way in.