Can anyone explain this. I was schedule to go out of DCA to MSP last Friday afternoon at 12 and way flying on a B fare. On Thursday I changed it give the weather to the 8:30 flight. I did not sleep Thursday and got up early Friday changed to the 6:45 AM flight. I checked in the night before for the 8:30 flight and had a boarding pass. I reprinted the boardin pass when I arrive and found that I was now on a Coach Select Bonus Fare. ^ So my question about Coach Select is it based on the fare on based on the flight or based on the fact that I checked in at the kiosk which I almost never do.

Thanks in advance.