DL 5232 then UA 6190 at Detroit
Memphis → Detroit → Washington
Timetable, Detroit time
20:50DL 5232 from Memphis at the gate
14:45UA 6190 to Washington leaves the gate
17 h 55 apart on the timetable, overnight
UA 6190 leaves 17 h 55 after DL 5232 arrives on the timetable: more than half a day, so not a connection we count.