Looking at that, I would say that MSP approach would have been totally out of the loop until it became a concern that there might possibly be an emergency of some sort.
At 37,000 the flight was never in their territory. Even with the knowledge that the flight was an inbound, they would probably look at the target and think he was diverting to O’hare or something.
I saw the flight path on Flightaware and it isn’t like he was high or low. From the track I saw they were heading right down the middle of MSP center territory. So it didn’t get noticed that they didn’t switch over to MSP center and approach. Basically no one noticed them and that there was no contact until they were on top of MSP. So besides the pilots being dumb asses, I wonder what the people at MSP approach were doing. Well, like I posted on Flyertalk that was then posted here, my pilot friend said that he bet that someone in the centers dropped the ball and will get in trouble. It looks like he may be right. Will be interesting to follow this more and hear what else comes out.