AA 3160 then UA 4789 at O'Hare
Boston → Chicago → Fargo
Timetable, Chicago time
20:28AA 3160 from Boston at the gate
19:45UA 4789 to Fargo leaves the gate
23 h 17 apart on the timetable, overnight
UA 4789 leaves 23 h 17 after AA 3160 arrives on the timetable: more than half a day, so not a connection we count.