DL 3968 then DL 554 at Seattle
Vancouver → Seattle → Atlanta
Timetable, Seattle time
16:53DL 3968 from Vancouver at the gate
12:00DL 554 to Atlanta leaves the gate
19 h 07 apart on the timetable, overnight
DL 554 leaves 19 h 07 after DL 3968 arrives on the timetable: more than half a day, so not a connection we count.