DL 5603 then AS 306 at Boston
Madison → Boston → Seattle
Timetable, Boston time
18:52DL 5603 from Madison at the gate
18:37AS 306 to Seattle leaves the gate
23 h 45 apart on the timetable, overnight
AS 306 leaves 23 h 45 after DL 5603 arrives on the timetable: more than half a day, so not a connection we count.