AS 279 then DL 1655 at Boston
Seattle → Boston → San Francisco
Timetable, Boston time
17:17AS 279 from Seattle at the gate
16:50DL 1655 to San Francisco leaves the gate
23 h 33 apart on the timetable, overnight
DL 1655 leaves 23 h 33 after AS 279 arrives on the timetable: more than half a day, so not a connection we count.