UA 1341 then AA 597 at San Francisco
Detroit → San Francisco → Chicago O'Hare
Timetable, San Francisco time
19:31UA 1341 from Detroit at the gatealso OZ 9538
17:22AA 597 to Chicago O'Hare leaves the gatealso QF 4712
21 h 51 apart on the timetable, overnight
AA 597 leaves 21 h 51 after UA 1341 arrives on the timetable: more than half a day, so not a connection we count.