AS 279 then DL 508 at Boston
Seattle → Boston → Los Angeles
Timetable, Boston time
17:17AS 279 from Seattle at the gate
16:15DL 508 to Los Angeles leaves the gate
22 h 58 apart on the timetable, overnight
DL 508 leaves 22 h 58 after AS 279 arrives on the timetable: more than half a day, so not a connection we count.