I am going on my first trip to Japan this July and have a few questions about NRT.

I'm flying award UA metal from ORD to SFO, and ANA to NRT (Business).

UA NRT-ORD on UA Metal

Thoughts or feedback on ANA business.

Is there an arivals loung /showers that I can use as a *a Gold?

When taking off fon NRT I see some confusing threads on using *A lounges. I though I am only allowed to use the *A loung of the airline I am flying out on.

I have a UA RCC card and a *A card, canI use any *A? If so whats better at NRT.

Thank!