AA 642 then UA 4673 at O'Hare
Dallas-Fort Worth → Chicago → Appleton
Timetable, Chicago time
13:10AA 642 from Dallas-Fort Worth at the gate
12:48UA 4673 to Appleton leaves the gate
23 h 38 apart on the timetable, overnight
UA 4673 leaves 23 h 38 after AA 642 arrives on the timetable: more than half a day, so not a connection we count.