CASM on the 700s has to be going through the roof with the way they are performing plus NG fuel burn. Max 7 CASM will be way way lower and it will bring that entire denominator down for the whole system once the 700s are replaced. I do agree that 150 seats is a lot, but it seems like yield is king these days and load factor is a second thought. Just my observation from the cheap seats and flying a lot of half full airplanes (some totally full ones too on mostly longer routes).
It’s almost getting to the point where nonrevving is semi civil again since not all fares can jump the standby line and the computers have finally figured out how to squeeze more revenue out of 120 passengers than they used to from 143.