Call LH, and get the AC PNR, and look up the fare class in AC's reservation system. Just look at the letter and not the fare class description (Tango/Flex) since it's often wrong for codeshares. (Note though that I don't think there are any "normal" AC classes that earn 0 miles. I suspect you will earn 50% RDM (as a previous poster said, assuming if it's not a United ticket), and 100% PQM.)