UA 520 then AA 1732 at San Francisco
Burbank → San Francisco → Philadelphia
Timetable, San Francisco time
11:18UA 520 from Burbank at the gatealso AC 3286
09:46AA 1732 to Philadelphia leaves the gatealso BA 5616
22 h 28 apart on the timetable, overnight
AA 1732 leaves 22 h 28 after UA 520 arrives on the timetable: more than half a day, so not a connection we count.