Regarding aircraft assignment
Turn lines for SDF Bus, 757 and MD, be them morning or afternoon, are typically built to 12 duty days in a 28 day duty period with most weekend days off. Afternoon turns as a whole tend to run senior to morning turns.
Reserve all fleets is built for 14 duty days in a 28 day pay period, with various block lengths of RSV days.
SDF domestic night sort lines are all over the dang place...standard lines tend to be close to week on/off, day sort lines have trips ranging from 2-7 days, and Base Trip Lines are generally blocks of short trips back-to-back after 12-30 hours off in domicile.