There has been a lot of negative talk so far about the state of affairs with the NW fleet, particularly the DC-9's. I think it has been a gang up affair against NW and that probably is not fair. But my question is: When NorthWest accquired Republic in the early eighties, they inherited a lot of MD super 9's (MD 80's). According to an earlier post here, they have gotten rid of all of those 80's. I have also noticed that I have not seen them flying at my favorite airport where I go to plane watch. I do not understand why they would get rid of the newer planes and keep the much older ones, spending tons of money rebuilding them. It seems it would have been more economical to keep the MD 80's. and get rid of as many old DC 9's as they could. Can any one shed light on why they went that route? That is, if the earlier post was correct.