AA 642 then DL 2231 at O'Hare
Dallas-Fort Worth → Chicago → Salt Lake City
Timetable, Chicago time
13:10AA 642 from Dallas-Fort Worth at the gate
07:30DL 2231 to Salt Lake City leaves the gate
18 h 20 apart on the timetable, overnight
DL 2231 leaves 18 h 20 after AA 642 arrives on the timetable: more than half a day, so not a connection we count.