AA 5543 then UA 225 at Philadelphia
Northwest Arkansas → Philadelphia → San Francisco
Timetable, Philadelphia time
16:50AA 5543 from Northwest Arkansas at the gate
16:38UA 225 to San Francisco leaves the gate
23 h 48 apart on the timetable, overnight
UA 225 leaves 23 h 48 after AA 5543 arrives on the timetable: more than half a day, so not a connection we count.