AA 642 then UA 1532 at O'Hare
Dallas-Fort Worth → Chicago → New Orleans
Timetable, Chicago time
13:10AA 642 from Dallas-Fort Worth at the gate
10:41UA 1532 to New Orleans leaves the gate
21 h 31 apart on the timetable, overnight
UA 1532 leaves 21 h 31 after AA 642 arrives on the timetable: more than half a day, so not a connection we count.