AA 642 then UA 4531 at O'Hare
Dallas-Fort Worth → Chicago → Northwest Arkansas
Timetable, Chicago time
13:10AA 642 from Dallas-Fort Worth at the gate
12:29UA 4531 to Northwest Arkansas leaves the gate
23 h 19 apart on the timetable, overnight
UA 4531 leaves 23 h 19 after AA 642 arrives on the timetable: more than half a day, so not a connection we count.