DL 1510 then DL 472 at Atlanta
Miami → Atlanta → Seattle
Timetable, Atlanta time
14:55DL 1510 from Miami at the gate
14:05DL 472 to Seattle leaves the gate
23 h 10 apart on the timetable, overnight
DL 472 leaves 23 h 10 after DL 1510 arrives on the timetable: more than half a day, so not a connection we count.