AA 5998 then UA 225 at Philadelphia
Greensboro → Philadelphia → San Francisco
Timetable, Philadelphia time
17:49AA 5998 from Greensboro at the gate
16:38UA 225 to San Francisco leaves the gate
22 h 49 apart on the timetable, overnight
UA 225 leaves 22 h 49 after AA 5998 arrives on the timetable: more than half a day, so not a connection we count.