AA 6420 then UA 5433 at LAX
Seattle (SEA) → Los Angeles → San Francisco
Timetable, Los Angeles time
09:22AA 6420 from Seattle (SEA) at the gate
21:35UA 5433 to San Francisco leaves the gate
12 h 13 apart on the timetable
UA 5433 leaves 12 h 13 after AA 6420 arrives on the timetable: more than half a day, so not a connection we count.