9E and Compass do alot of SDF, I think mainline only does ATL-SDF. I cant speak for 9E personally (other than I deadhead to or from SDF on them alot, often DTW-SDF or SDF-DTW), but Compass does many, many overnights there.(Mx base on the field, most of the MSP-SDF has been Compass the last few years) Multiple Crews per day overnight there... It seems Endeavor has a similar amount of fights as well, probably more of the DTW routes. Search Flightaware and get a feel for flights. Compass would be CPZ#### and Endeavor I believe would be EDV####. Someone else can chime in on the overnights, but I would imagine its daily as well.