AA 642 then UA 6041 at O'Hare
Dallas-Fort Worth → Chicago → Des Moines
Timetable, Chicago time
13:10AA 642 from Dallas-Fort Worth at the gate
08:50UA 6041 to Des Moines leaves the gate
19 h 40 apart on the timetable, overnight
UA 6041 leaves 19 h 40 after AA 642 arrives on the timetable: more than half a day, so not a connection we count.