Originally Posted by FTv3

Right now the MD is still flirting with some intl schedules while the domestic rosters continue as planned. As an outsider I would say the MD domestic schedules aren’t as bad as what the true narrow body domestic fleets have to endure - it is a more senior airframe.

Oversimplified generalization:

74 = long haul international
z = Europe and Asia hub sort flying
75D & bus = true domestic
MD = somewhat domestic with lingering international long haul