First off, this is a relatively large improvement over last years (-21%) margin across the Pacific. The fact that the losses aren't as bad shows the new cost structure is slightly helping AA's situation.
Now, a few things will help AA across the Pacific:
1) As Commavia and Jayunited have mentioned, the 777 reconfiguration will be dramatically helpful. Less F, a little more J and perhaps an additional 15-20 seats in Y with 10 abreast will help stem the losses.
2) The addition of the 787 this fall will help lower operating cost significantly. I assume these aircraft will be deployed on highly competitive routes out of LAX and ORD.
3) AA will now be getting feed from US. This feed used to go to UA b/c they were STAR partners, but most of those people will now be flowed through the AA network. Hopefully his will ensure planes go out full. After all, an empty seat is money lost.
4) Increased presence in the region (through new flights like DFW-PVG,HKG, ICN) and time will help AA develop as a serious competitor in the region..... Let's not forget AA is relatively new in the Asia market (outside of Japan). They are nowhere near as mature as DL or especially UA.
These things will certainly help AA across the Pacific, but they certainly won't make AA a profitable sensation overnight.