AA 642 then UA 441 at O'Hare
Dallas-Fort Worth → Chicago → Dallas-Fort Worth
Timetable, Chicago time
13:10AA 642 from Dallas-Fort Worth at the gate
11:47UA 441 to Dallas-Fort Worth leaves the gate
22 h 37 apart on the timetable, overnight
UA 441 leaves 22 h 37 after AA 642 arrives on the timetable: more than half a day, so not a connection we count.