AA 642 then UA 2816 at O'Hare
Dallas-Fort Worth → Chicago → Raleigh-Durham
Timetable, Chicago time
13:10AA 642 from Dallas-Fort Worth at the gate
12:50UA 2816 to Raleigh-Durham leaves the gate
23 h 40 apart on the timetable, overnight
UA 2816 leaves 23 h 40 after AA 642 arrives on the timetable: more than half a day, so not a connection we count.