Oh this one has me thinking and many open dates OCT-DEC! You can get the lowest CPM on a weekday run but for just a little more and still staying sub 5CPM all on a weekend. You can even for around 6-8CPM look at a number of days in 1st class 🙂
You will want to use the switch “DL+ X:DTW” both ways for lowest CPM or tinker with “DL+ X:MSP” outbound and “DL+ X:DTW” back. Many ways you can tinker. I am thinking about one of these but would fly down day before, spend time in the Centurion after positing flight, the next day before run, and clearly in SFO between flights. Not bad but I really don’t “need” more MQMs this year – #FirstWorldProblems.
Here are the numbers with a HT to FT for the find:
6,132 MQMs at 3.9CPM
Bookable on Delta.com
Search ITA Matrix with switch DL+ x:MSP and or DL+ x:DTW
Lastly, do always consider the fact that, with the current Delta Platinum offer for both the personal and business cards, 10,000MQMs for the card fee is sub 2CPM and after $100 statement credit sub 1CPM mileage run from home! 😉