Originally Posted by
woodenshoe101
Data point: iPhone app just offered $750 upgrade on my DTW-AMS flight tomorrow (DL0234).
I must have pissed off the app when I declined because it didn't give me an E-boarding pass

.
Not worth $750 on that flight. Wait for the op-up (as another poster said, it's oversold) or enjoy coach and put the $750 to better use.