Originally Posted by
IceTrojan
Indeed, though you may get some light pushback from the agents from the JL counter, usually along the lines of, "Did you know that there is an Admirals Club down this way?"
But they'll let you in.
I've been to the Sukura F lounge in NRT 25+ times always with a ticket issued by AA (often to a Y JL flight) and have never met any resistance being admitted. There is now a F section in the Satellite terminal.
Showers are poor but everything else is top notch.