UA 4500 then AA 2866 at Dulles
Detroit → Washington → Dallas-Fort Worth
Timetable, Washington time
21:17UA 4500 from Detroit at the gate
19:09AA 2866 to Dallas-Fort Worth leaves the gate
21 h 52 apart on the timetable, overnight
AA 2866 leaves 21 h 52 after UA 4500 arrives on the timetable: more than half a day, so not a connection we count.