As stated by others, premium economy on a OW partner, e.g. BA/ CX is usually the cheapest way to get 1.5 EQP/EQM, and far cheaper than getting Y/B fares on AA.
I usually qualify for EXP on points, although because I do fly on AA (paid Y cabin, but not Y/B fares) aswell, I tend to fly between 75k to 85k miles per year.
tb