What's the story with DL407 (JFK-ZRH) on Friday 10/2?
When you look at the seating chart, I would map it as a 76H/76Z configured plane which shows Economy Comfort for 13-17 on the 2x areas (AB & FG) and 13-16 CDE on the middle section.
Delta.com, however, shows the middle section 13-14 as preferred seats rather than Economy Comfort. I didn't know that there were any planes configured in such format.