luv2fly
Veteran
Delta is withdrawing 45 aircraft from its fleet in order to achieve a 10% year-over-year decrease in domestic capacity (TheStreet.com). Northwest is likely to ground a whole bunch of fuel guzzling ancient DC-9s. The two carriers' route networks may overlap on only 12 non-stop city pairs; however, the majority of passengers of network carriers connect at hubs en route to their destinations. There is much more overlap of the Delta and Northwest networks than that figure would suggest.
My statement was in regards to any necessitated DOJ divestitures. What happens after the merge is purely speculative. In addition, 25 of the 45 aircraft you refer to are 50 seat RJ's.
Northwest operates a DC-9 fleet that totals roughly 100 aircraft and IIRC from the ALPA presentation, approximately 35 are scheduled for retirement.