Passengers certainly do expect a clean/safe aircraft, and I think that the DC-9 actually still delivers that. No, there's no AVOD, but the interiors are up-to-date, and the planes themselves are well maintained mechanically.
I rarely fly, but prefer the A319/320 as well. As far as working them, I *definitely* prefer the 'bus- it's arguably the most "ramp-friendly" plane out there. JMHO.
I think they're pursuing the 717-and MD90's- for the simple reason that they can acquire outright a relatively new A/C that meets network needs much cheaper than leasing-or buying- other types (737-900 order notwithstanding). They've stated publicly that the long range goal is to own an A/C for 20-30 years, as opposed to leasing. in the rumored 717 case, it's a good fit for many ex-LGA routes, and some shorter haul out of MSP & DTW. I'm sure there's other places it'd work as well .
Its amazing you feel the DC-9 is a safe and clean aircraft for DL to operate. Many of the DC-9s are older than me and other passengers! You're sounding like Bob Owens complaining about AA ordering new 737-800s to replace MD-80s when that money could be used for wages and benefits, and the older maintenance heavy MD-80s provide more job security. Mind you that the 738s provide AA fuel savings and each delivery is a net cash positive even in the words of Tom Horton. Why is the A320 family better on the ramp than the 737? Do the A320s have larger cargo holds?
If the 717s are so great, why didn't DL/NW order them in the late 1990s-early 2000s? Boeing didn't score many orders for them, many of the operators have come and gone. TWA had some that I flew years ago from JFK and quite liked it, Bangkok Airways had them for flights to Phuket and Koh Samui from BKK, AirTran has used them and now WN is uninterested, why is DL suddenly interested? Perhaps they can acquire them cheap but wouldn't it be better to standardize the fleet with modern, fuel efficient aircraft?
Josh