AA 642 then AA 1366 at O'Hare
Dallas-Fort Worth → Chicago → Denver
Timetable, Chicago time
13:10AA 642 from Dallas-Fort Worth at the gate
11:54AA 1366 to Denver leaves the gate
22 h 44 apart on the timetable, overnight
AA 1366 leaves 22 h 44 after AA 642 arrives on the timetable: more than half a day, so not a connection we count.