AA 642 then UA 4436 at O'Hare
Dallas-Fort Worth → Chicago → Springfield Branson National
Timetable, Chicago time
13:10AA 642 from Dallas-Fort Worth at the gate
12:45UA 4436 to Springfield Branson National leaves the gate
23 h 35 apart on the timetable, overnight
UA 4436 leaves 23 h 35 after AA 642 arrives on the timetable: more than half a day, so not a connection we count.