AA 642 then UA 2668 at O'Hare
Dallas-Fort Worth → Chicago → Washington National
Timetable, Chicago time
13:10AA 642 from Dallas-Fort Worth at the gate
11:05UA 2668 to Washington National leaves the gate
21 h 55 apart on the timetable, overnight
UA 2668 leaves 21 h 55 after AA 642 arrives on the timetable: more than half a day, so not a connection we count.