Owenc
Norwegians entire narrow body fleet is all economy with either 186 or 189 seats, the MAX aircraft are all 189 seats, a combination of slim line seats and the new narrower toilet cubicle means the leg room is the same in either config give or take a knats whisker.
the use of secondary airports in the USA keeps costs and fares down but means there is probably not much premium traffic to be had and any such seats would attract punitive APD out of EDI
The personal feed back that I have had from passengers post flight is positive, touch down to gate time is never more than 5 minutes at PVD or SWF and about 10 minutes from push to take off on the MAX and 7 minutes on the NG
With 180 minutes ETOPS fuel tech stops don’t happen, having said that 189 and normal jet stream winds is not possible and loads are capped, east bound is no problem and I have 191 with ID crew on the jump seats.
word is that the MAX will replace the A321NeoLR next year