I was not sure of mileage earning rules on AA codeshare (on Japan Airlines ) if lower level fares earn 100% miles in Advanatage? I know if I book KHH-NRT-SAN on JL its 30% miles rate on the lower fare if its coded JL, the AA codeshare is $3more $954 vs. $957,so was wondering it makes any difference as far as mileage earning?