AA 642 then UA 5996 at O'Hare
Dallas-Fort Worth → Chicago → Colorado Springs
Timetable, Chicago time
13:10AA 642 from Dallas-Fort Worth at the gate
08:55UA 5996 to Colorado Springs leaves the gate
19 h 45 apart on the timetable, overnight
UA 5996 leaves 19 h 45 after AA 642 arrives on the timetable: more than half a day, so not a connection we count.