In the summer the avro will do MEM-GRR once a day, timed perfectly for commuters. But then again, all flights in MEM are well timed for commuters the way the push system is set up. We have a MEM capt that commutes from GRR and I remember him saying it's pretty easy. Between the hub commuting is tricky, because you're now competing with full flights, NWA and PNCL pilots and FAs.
They're not back filling FO positions in CVG but that's the base that does ALL bridge flying. It isn't uncommon that you'll see all 3 hubs on a 4 day trip. But between MEM and DTW you'll definitely get your fair share of bridge flying at some point.
FO