DL 5319 then UA 4500 at Detroit
Pittsburgh → Detroit → Washington
Timetable, Detroit time
07:13DL 5319 from Pittsburgh at the gate
19:45UA 4500 to Washington leaves the gate
12 h 32 apart on the timetable
UA 4500 leaves 12 h 32 after DL 5319 arrives on the timetable: more than half a day, so not a connection we count.