DL 5307 then UA 4500 at Detroit
Cincinnati → Detroit → Washington
Timetable, Detroit time
07:39DL 5307 from Cincinnati at the gate
19:45UA 4500 to Washington leaves the gate
12 h 06 apart on the timetable
UA 4500 leaves 12 h 06 after DL 5307 arrives on the timetable: more than half a day, so not a connection we count.