AA 948 then UA 4789 at O'Hare
San Francisco → Chicago → Fargo
Timetable, Chicago time
20:17AA 948 from San Francisco at the gate
19:45UA 4789 to Fargo leaves the gate
23 h 28 apart on the timetable, overnight
UA 4789 leaves 23 h 28 after AA 948 arrives on the timetable: more than half a day, so not a connection we count.