My faith in Delta is restored. I rebooked myself online but then called this morning and...here in China, someone answered right away! They couldn't rebook me on the flight to Atlanta this afternoon so I'm keeping what I booked but they are refunding the $150 I paid for the change ticket from Detroit-Cincinnati. So, same flight, different day.
I'm bored of Shanghai so I might take another ride to the airport and ride the Maglev just for fun.