A month or two DL became really flaky about sending upgrade email notices. I haven't received any for the last 4 upgrades, and reports here and on FT show this is widespread. I switched my itinerary two weeks ago, moved the flights by two days, but they are e-mailing me flight announcements for the segments that I cancelled. They called me 24 hours before a flight out of JFK with details about how the flight is leaving from T2, and I have to go to T2 to check in. Note that this is for an itin where I am connecting from an inbound TATL DL flight. This wouldn't be bad except that, when I see a voicemail from DL in the 24 hour window I assume flight CX or delay, and so checking that voicemail internationally could be problematic for some people. (thanks to Google Voice, it's no problem). Bottom line, this stuff is just sloppy. DL used to have such good IT 4 or 5 years ago, what happened?