The MU leg wasn't the difficult part. DTW-PVG and HKG-DTW along with the domestic legs in first/business are the difficult ones to find. Somehow there were I find them both on the perfect dates I wanted. Connecting the dots PVG-HKG was no problem and there was availability on most of the dates I checked. Unfortunately no way to check those on line and sometimes even the Delta agents don't know about MU flights. One agent even told me I could not use that leg because it wasn't a Delta codeshare.