AS 81 then DL 438 at Seattle
Anchorage → Seattle → Boston
Timetable, Seattle time
12:38AS 81 from Anchorage at the gate
11:45DL 438 to Boston leaves the gate
23 h 07 apart on the timetable, overnight
DL 438 leaves 23 h 07 after AS 81 arrives on the timetable: more than half a day, so not a connection we count.