Originally Posted by
michael_v
I was able to find DTW-CDG 7/3, DUB-DTW 7/10/13 for 4 seats in coach, but nothing more. It is very hard to find AF during the peak summer season. The only hidden gem left would be AZ, but since they don't fly to your airports, it would be nightmare to find DL connecting flights at low level. I would advise you to go to *A and use DL for something else.
Starting from DTW there's hope. I checked a few routes and there were generally a handful of options to fly at least 4 people together. Likely you could piece something together.
It all comes down to how much you want to work the DL option. It's likely doable, but will take some coaxing.