AA 2123 then UA 4789 at O'Hare
Los Angeles → Chicago → Fargo
Timetable, Chicago time
20:04AA 2123 from Los Angeles at the gate
19:45UA 4789 to Fargo leaves the gate
23 h 41 apart on the timetable, overnight
UA 4789 leaves 23 h 41 after AA 2123 arrives on the timetable: more than half a day, so not a connection we count.