AA 642 then UA 1116 at O'Hare
Dallas-Fort Worth → Chicago → San Francisco
Timetable, Chicago time
13:10AA 642 from Dallas-Fort Worth at the gate
07:35UA 1116 to San Francisco leaves the gate
18 h 25 apart on the timetable, overnight
UA 1116 leaves 18 h 25 after AA 642 arrives on the timetable: more than half a day, so not a connection we count.