What the OP hasn't said is how many miles he wound up with and how many he was able to carry over?
and yes I used to fly FNT-DTW a lot going back to when they flew airbuses on the route and filled them up and Mrs Bob H and I used to do things like FNT-DTW-MEM--xxx and then stay in xxx a day or two to play tourist.
Also, I wonder why he started his SR so late in the day.
Bob H