LA 6139 then AA 2663 at San Francisco
Boston → San Francisco → Philadelphia
Timetable, San Francisco time
00:24LA 6139 from Boston at the gate
23:59AA 2663 to Philadelphia leaves the gatealso EI 7356
23 h 35 apart on the timetable
AA 2663 leaves 23 h 35 after LA 6139 arrives on the timetable: more than half a day, so not a connection we count.