AA 6346 then UA 4789 at O'Hare
Lexington → Chicago → Fargo
Timetable, Chicago time
19:59AA 6346 from Lexington at the gate
19:45UA 4789 to Fargo leaves the gate
23 h 46 apart on the timetable, overnight
UA 4789 leaves 23 h 46 after AA 6346 arrives on the timetable: more than half a day, so not a connection we count.