UA 3851 then AA 3035 at San Francisco
Rio De Janeiro → San Francisco → Philadelphia
Timetable, San Francisco time
17:41UA 3851 from Rio De Janeiro at the gate
15:14AA 3035 to Philadelphia leaves the gatealso FJ 5025
21 h 33 apart on the timetable, overnight
AA 3035 leaves 21 h 33 after UA 3851 arrives on the timetable: more than half a day, so not a connection we count.