Originally Posted by Avman
You've all got it wrong. They loaded DTW, their other hub, iso MSP into the FMS. The error only came to light when the F/A intervened.
I think this is a plausible theory and one that can be easily proved by looking up the destination airport as stored on the Flight Data Recorder / ACMS. Of course, there are more holes in the cheese in that scenario too (such as loosing radio-contact).