There're still no DTW-SFO or v.v. flights. There's a DTW-LAX flight that stops en route, but it's less than 2000 mi.

Note that if your aim is to make BAEC Gold, you could allocate your domestic AA metal flights (and some others later) to an AA Platinum Challenge and make it, thus ending up with both Gold and Plat. Mileage earning on AA is better than on BA in many cases.