AS 2345 then DL 438 at Seattle
Calgary → Seattle → Boston
Timetable, Seattle time
12:21AS 2345 from Calgary at the gate
11:45DL 438 to Boston leaves the gate
23 h 24 apart on the timetable, overnight
DL 438 leaves 23 h 24 after AS 2345 arrives on the timetable: more than half a day, so not a connection we count.