Originally Posted by
mvoight
It depends on the fare class. If you look at the partner info on the AA website, you can see which fare codes are needed.
Is the NRT-SIN-NRT part of your trip on an AA flight number?
If so, you'll accrue full miles on those segments. Under a JL code, you're likely looking at 50%, or 70%, or in some rare cares, 0% credit. Also, no elite status bbonuses under JL code.