I am considering joining AMEX platinum Charge Card because of the companion ticket feature (1 ticket anywhere in world from anyfare - good deal). But I am a bit confused over the Empress lounge Membership features -

Does Empress Membership allow access to all Oneworld partner lounges if I am not travelling business class with them?

and

Does membership allow me to use Empress lounges even if I am not travelling Canadian that day?

Dave (Toronto/Xiamen/Adelaide)