Many thanks, i was wondering if I would have an opportunity to request the earlier flight when we rechecked. I wasn't sure whether it would be a desk or just a baggage drop..
In DTW you don't get to the Delta ticket desks until back in the terminal. ie after you have re-checked your bags and cleared security again.
Once you've collected your bags from the carousel and cleared customs you proceed straight to one of 3 conveyor belts where your checked baggage is placed.
I've flown through DTW many times, it's a great airport, and I've never missed a connection there. Even some as tight as 40 mins. I've tried to get on to earlier connecting flights in the past, but have been denied as I had checked luggage. But it's not to worry, there is a lot to do and see in DTW, so you won't be bored waiting for your flight.