I tried to book some travel using their calendar, it indicated phantom availability. Two types of errors: 1) the skysaver available dates show up as only sky choice when you actually get flights and 2) it can come back and say "there are no flights available for the day requested."

Naturally I came to flyertalk and in about 1 second found this thread...good job Delta. This is but one of a list of several issues. Ever since emerging bankruptcy (from my perspective) they've been doing their best to push customers away, it's like they feel comfy under court protection. I suppose this has more to do with the changing "leader"ship.