Wow, you are quick
I am planning an OW RTW in F.
I hope I can make top tier with this in "one round".
After this, I would use CX sometimes in Asia. NA is not one of my frequent travel targets.
Address in U.S. would be possible.
I just read on the BA homepage that they offer mileage for ALL fare classes and they never expire, no matter of status. This sound convenient, but might be standard in OW. I was also searching the BA website about how to earn miles and tier points with them but they seem to hide it somewhere (: