those are the same seats that NW had on the aircraft.
DL is in the process of modding the entire 320/319 fleet and they need it.
and a big advantage of the 320 family is to have wider seats. NW "dumbed down" the seat to 737 widths.
It should have been changed years ago; and the ability to have a 18 inch seats is an advantage that carriers including DL should take from Airbus.
again, WN is doing the right thing to put wider seats on aircraft. we'll see how well the other aspects of the seat compare but more space for customers is a good thing regardless of the carrier.
btw, you do realize that AA's new 319s and UA's 320 family aircraft do not have 18 inch coach seats?
according to seat guru, US is the only large US airline that has 18 inch wide seats across its entire fleet of 320 family aircraft
and even the new WN seats are not 18 inch seats.