UA 6246 then DL 1355 at Detroit
Washington → Detroit → Tampa
Timetable, Detroit time
18:56UA 6246 from Washington at the gate
18:15DL 1355 to Tampa leaves the gate
23 h 19 apart on the timetable, overnight
DL 1355 leaves 23 h 19 after UA 6246 arrives on the timetable: more than half a day, so not a connection we count.