F9 3990 then UA 3644 at Detroit
Dallas-Fort Worth → Detroit → Newark
Timetable, Detroit time
21:43F9 3990 from Dallas-Fort Worth at the gate
19:11UA 3644 to Newark leaves the gate
21 h 28 apart on the timetable, overnight
UA 3644 leaves 21 h 28 after F9 3990 arrives on the timetable: more than half a day, so not a connection we count.