DL 2091 then UA 4500 at Detroit
Syracuse → Detroit → Washington
Timetable, Detroit time
07:36DL 2091 from Syracuse at the gate
19:45UA 4500 to Washington leaves the gate
12 h 09 apart on the timetable
UA 4500 leaves 12 h 09 after DL 2091 arrives on the timetable: more than half a day, so not a connection we count.