DL 9979 then DL 472 at Atlanta
Detroit → Atlanta → Seattle
Timetable, Atlanta time
15:41DL 9979 from Detroit at the gate
14:05DL 472 to Seattle leaves the gate
22 h 24 apart on the timetable, overnight
DL 472 leaves 22 h 24 after DL 9979 arrives on the timetable: more than half a day, so not a connection we count.