Are there any arrival louges at SFO?
 

DH and I will be arriving SFO from OZ 214 in business on Oct. 24. We have a 6 hour layover until our next flight on UA, economy. These are award tickets issued by ANA.

Does Asiana have a reciprocal agreement to use another airline's arrival lounge? I know they do not have their own at SFO.

Nope. UA has an arrivals lounge, but it is only for its own F and C (non-upgrades from Y) passengers.

There is a shop that offers shower facilities (paid) in the Int'l departure terminal. I think it is on the same level as departures, far to the right of the security entrances. It's not fancy, but if you want a shower, it does the job. Unfortunately, I forget the name.