NWA MEC publication "Across the Table", March 2006 I believe.
Do you have a copy of it? Is it the one that states the following:
...
Management made
a case that 76-seat aircraft in a dual-class configuration were
needed to compete in the future and, importantly, that they
would not be used to replace DC-9 aircraft.
It is our belief that 51–76-seat aircraft will not accelerate
the retirement of the DC-9 fleet. NWA’s business plan shows
the DC-9 fleet continuing to operate well into the future,
with many of the aircraft remaining in the fleet until
mandatory cycle limits require their retirement from service.
The demand for 100-seat aircraft at NWA is very real