I have a similar question. I am a UC member (thanks to the CO Pres Plus card) with star-silver status.

I have an complex itin coming up and I am wondering about lounge access in a few different scenarios. This ticket is in Y and issued by ANA.

1. flying LH from Moscow to London via FRA. In FRA can I access any *A lounge?

2. continuing from LHR to MCO via EWR on UA. In EWR can I access any *A lounge? My connection is a domestic flight but I am connecting onwards from an international flight.

3. Finally I am flying from MCO direct to YYZ on AC. Can I access any *A lounge in MCO?

Thanks