Given the nature of the airline industry, I'm surprised that there aren't more delays. Think about just how much could go wrong with airplanes, some of the most costly and complicated pieces of machinery ever to exist.
As for DL's "no canceled flights" goal, it may be nice that it does happen on certain days, but it's just not going to happen for the same reason as my first sentence: too many variables that could go awry.
The days of ham-carved-in-front-of-you, your tray having porcelain dishes on it, and being able to check 3 free bags in economy are long gone, and are never coming back.
-LPDAL