AA 642 then UA 1862 at O'Hare
Dallas-Fort Worth → Chicago → Punta Cana
Timetable, Chicago time
13:10AA 642 from Dallas-Fort Worth at the gate
09:17UA 1862 to Punta Cana leaves the gate
20 h 07 apart on the timetable, overnight
UA 1862 leaves 20 h 07 after AA 642 arrives on the timetable: more than half a day, so not a connection we count.