Originally Posted by rikahlberg
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.
This is just wrong - as a OneWorld Emerald you have access to any OneWorld airline lounge (F or J) when flying on a OneWorld airline from that airport that day. I have never had any difficulty at all with this (except once with FinnAir in Helsinki, where they took some persuading). The only exception is for AA EXPs flying on "domestic" North American flights.
I notice though that your profile says AA Plat, which is OneWorld Sapphire, not Emerald. In this case you would be refused access to F lounges, but you would have access to J lounges (with the same exception for North American flights).