Anyone wanting to earn Delta miles should make sure to buy the KE flight number options, not the DL flight number options. KE flight number options will earn tons of miles -- over 25K MQMs and over 7K MQDs if coming from the East Coast of the US, plus lots of redeemable miles, over 50K if you have high Delta status. Delta flight numbers would earn same MQMs but much less MQDs and RDMs (driven by the ticket price).