I did it for 6 years with Pinnacle/Endeavor. Most of the time I had to go though DEN, ORD or LAS. The only thing that helped me was the misconnect pax going from DTW to the west coast. I had to come in the day before a trip unless it was a CDO. Crash pad is a must unless you don't mind paying for at least 4-5 nights of hotel. I found that SEA-DTW was rough. Alaska and Spirit would be a good back up if you choose the SEA-DTW, or SEA-MSP there's hardly any non-revs on those flights compared to Delta flights. I've gotten release from a few DH in DTW and MSP recently and trying to find a way home didn't seem as bad as it was 3+years ago.