That is correct, we just call them DC9-80
to differentiate them from the MD-80`s
The A/C now on their way to Midwest, were
the only ones with an all analog cockpit.
The MD-80`s were all modified with classcockpits, and continue to be a joy to fly. The ex. Swissair A/C are leaving simply
to save some money on crew, or rather to
increase flexibility in scheduling of cockpit crew.