AS 615 then DL 560 at Seattle
St Louis → Seattle → Atlanta
Timetable, Seattle time
08:36AS 615 from St Louis at the gate
23:40DL 560 to Atlanta leaves the gate
15 h 04 apart on the timetable
DL 560 leaves 15 h 04 after AS 615 arrives on the timetable: more than half a day, so not a connection we count.