UA 6366 then LN 744 at Dulles
Savannah → Washington → Buffalo
Timetable, Washington time
11:31UA 6366 from Savannah at the gate
04:00LN 744 to Buffalo leaves the gate
16 h 29 apart on the timetable, overnight
LN 744 leaves 16 h 29 after UA 6366 arrives on the timetable: more than half a day, so not a connection we count.