DL 5031 then UA 4500 at Detroit
Toronto → Detroit → Washington
Timetable, Detroit time
07:43DL 5031 from Toronto at the gate
19:45UA 4500 to Washington leaves the gate
12 h 02 apart on the timetable
UA 4500 leaves 12 h 02 after DL 5031 arrives on the timetable: more than half a day, so not a connection we count.