aa will only give 75% of the miles if you fly on qantas, and they will give nothing if they themselves fly that route. e.g. if you fly round the world on oneworld ticket mel - lhr - jfk on british and then jfk - lax - mel on qantas, you will only get 75% of miles for the mel-lhr and then lax-mel, while from lhr-jfk-lax, you will get nothing since aa flies that route. (i know this from experience and learning the hard way, i received on aa for this trip about 14,000 miles, in comparism to star alliance where i would have received about 25,000 miles!)