DL 1598 then TP 4392 at San Francisco
Los Angeles → San Francisco → Boston
Timetable, San Francisco time
07:10DL 1598 from Los Angeles at the gatealso AM 4306
22:10TP 4392 to Boston leaves the gate
15 h apart on the timetable
TP 4392 leaves 15 h after DL 1598 arrives on the timetable: more than half a day, so not a connection we count.