AV 2191 then UA 3906 at San Francisco
Sydney → San Francisco → Chicago O'Hare
Timetable, San Francisco time
06:25AV 2191 from Sydney at the gate
19:30UA 3906 to Chicago O'Hare leaves the gate
13 h 05 apart on the timetable
UA 3906 leaves 13 h 05 after AV 2191 arrives on the timetable: more than half a day, so not a connection we count.