AS 459 then DL 1706 at Seattle
Boston → Seattle → Detroit
Timetable, Seattle time
10:39AS 459 from Boston at the gate
09:45DL 1706 to Detroit leaves the gate
23 h 06 apart on the timetable, overnight
DL 1706 leaves 23 h 06 after AS 459 arrives on the timetable: more than half a day, so not a connection we count.