Shhhh..... Me and my wife both have the DL Amex platinum card and each received a "threshold bonus" of 10k MQMs about a month ago, being NOwhere near the mileboost threshold, and then, about two weeks ago, we each got an extra 15k RDMs, labeled Amex cobranded credit card. We are both setup up on separate accounts, so we have no clue why we both got these. We're not holding our breath though, if Amex/DL realizes its mistake and takes them back, we won't be disappointed/argue with them.