DL 1787 then UA 52 at Dulles
Detroit → Washington → Zurich
Timetable, Washington time
16:28DL 1787 from Detroit at the gate
15:37UA 52 to Zurich leaves the gate
23 h 09 apart on the timetable, overnight
UA 52 leaves 23 h 09 after DL 1787 arrives on the timetable: more than half a day, so not a connection we count.