It is not called C+ (I think that is a new FT term). It is called Delta Comfort+.
http://www.delta.com/content/www/en_...g_id=313x11648
I have not flown the "new" Delta Comfort+, as I ride in front of the curtain. If what DL is stating is true, Delta Comfort+ is currently a much better product than what UA and AA currently offer. Free booze and better snacks.
With this logic, those sitting in FC on DL would be an "F" grade in the "great" USA educational system. "C+" is much better than an "F".
So Business Class gets a "B"?
Kettle class gets a "Y"? (Or a "D" for effort).
Delta Comfort+ = "C+" only on FT. Sounds good to me. I'll be the old grump sitting in "F" enjoying the finest in food, beverage and service at 35,000 feet.
"2B or not 2B". "1A" if I am the "smartest" on the plane.