I'm a Platinum with USAir and a Gold with AA. I have a trip coming up booked through AA. It's a code share British Airways flight (two legs to Abu Dhabi from PHL).

Is there an advantage to using my USAir Dividend Miles number versus my AA Advantage number to earn miles? I currently haven't flown AA this year but have 25 segments and 28,000 miles through USAir YTD.

Thanks for any thoughts.