UA 3852 then AA 1353 at San Francisco
Ontario → San Francisco → Chicago O'Hare
Timetable, San Francisco time
10:55UA 3852 from Ontario at the gate
07:13AA 1353 to Chicago O'Hare leaves the gatealso IB 4078, QF 4693, EI 7102
20 h 18 apart on the timetable, overnight
AA 1353 leaves 20 h 18 after UA 3852 arrives on the timetable: more than half a day, so not a connection we count.