AS 375 then DL 438 at Seattle
Washington → Seattle → Boston
Timetable, Seattle time
12:20AS 375 from Washington at the gate
11:08DL 438 to Boston leaves the gate
22 h 48 apart on the timetable, overnight
DL 438 leaves 22 h 48 after AS 375 arrives on the timetable: more than half a day, so not a connection we count.