Originally Posted by
jacobnut
It's tricky to calculate, but as
flyerCO said, it's best if you book with the DL codeshare. Just be sure that Flying Blue doesn't claim the miles... we just took a big trip in J on AF (booked the DL flight numbers through Delta), and Flying Blue claimed all of the credits so we didn't get any MQDs or MQMs. Now we're in the process of trying to get Flying Blue to "release" their claim so Delta can reclaim. Huge pain.
It's not always best to book under the DL codeshare. You need to look at the numbers in each individual case. It can also matter whether you need MQDs vs MQMs, or whether you're mostly interested in RDMs.