AA 642 then UA 5950 at O'Hare
Dallas-Fort Worth → Chicago → South Bend
Timetable, Chicago time
13:10AA 642 from Dallas-Fort Worth at the gate
07:45UA 5950 to South Bend leaves the gate
18 h 35 apart on the timetable, overnight
UA 5950 leaves 18 h 35 after AA 642 arrives on the timetable: more than half a day, so not a connection we count.