Interesting. I don't check AA codeshare prices very often, but all the ones that I've seen were at least 20% higher than the non-codeshare, and often much higher. Good to know that sometimes they are matching prices. I had always presumed that most of these codeshares existed to fill the needs of US govt contracts which require flying a US flag carrier whenever it serves a particular route -- even if the price is higher. Giving little incentive to match prices for codeshares. Apparently on some routes there is more to it than that.