UA 4500 then AA 5447 at Dulles
Detroit → Washington → Charlotte
Timetable, Washington time
21:17UA 4500 from Detroit at the gate
17:44AA 5447 to Charlotte leaves the gate
20 h 27 apart on the timetable, overnight
AA 5447 leaves 20 h 27 after UA 4500 arrives on the timetable: more than half a day, so not a connection we count.