AA 642 then UA 4512 at O'Hare
Dallas-Fort Worth → Chicago → Little Rock
Timetable, Chicago time
13:10AA 642 from Dallas-Fort Worth at the gate
08:45UA 4512 to Little Rock leaves the gate
19 h 35 apart on the timetable, overnight
UA 4512 leaves 19 h 35 after AA 642 arrives on the timetable: more than half a day, so not a connection we count.