Originally Posted by
WWads
I've found DFW-DTW-SFO-DTW-DFW on at least one weekend.
I've also found the reverse SFO-DTW-DFW-DTW-SFO on a couple weekends after all, some Fri/Sat and some Sat/Sun for $236 or not too much more.
I think what fooled me at first was I saw a bunch of those on ITA but couldn't get one to price out at DL, so I settled for the 5507 MQM itinerary, but prompted by your comment (thanks!) I canceled that and grabbed a 6132 on a Fri.