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

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Looks like your flight will be oversold in coach. Not a bad move by Delta, make some money by getting someone to pay for J instead of years past when they simply gave out OP UP's.
What class is your coach ticket in? Is the $750.00 amount the standard Delta asking for a buy up no matter what the class ticket was purchased in?