AA 642 then AA 1991 at O'Hare
Dallas-Fort Worth → Chicago → Salt Lake City
Timetable, Chicago time
13:10AA 642 from Dallas-Fort Worth at the gate
08:15AA 1991 to Salt Lake City leaves the gate
19 h 05 apart on the timetable, overnight
AA 1991 leaves 19 h 05 after AA 642 arrives on the timetable: more than half a day, so not a connection we count.