UA 2661 then JL 5892 at San Francisco
Philadelphia → San Francisco → Boston
Timetable, San Francisco time
09:22UA 2661 from Philadelphia at the gatealso NH 7021, CA 7299, VA 8451, NZ 9365
22:10JL 5892 to Boston leaves the gate
12 h 48 apart on the timetable
JL 5892 leaves 12 h 48 after UA 2661 arrives on the timetable: more than half a day, so not a connection we count.