Just a side-note as one who pays attention to schedules especially CO's, I do not even see a 737-800 operating out of CMH. Almost everything is RJ;s and 1 735, most of been an aircraft sub or planned operation. I see lots of aircraft sub's based on what the schedule says. I know weekends have alot of equipment changes.
It used to be years ago same aircraft type operated same routes 7 days a week. I know this is complex related to loads and maintenance requirments. I wished I worked in opertions, sounds like a interesting job.