DL 5226 then UA 4500 at Detroit
Providence → Detroit → Washington
Timetable, Detroit time
07:39DL 5226 from Providence 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 5226 arrives on the timetable: more than half a day, so not a connection we count.