UA 3917 then AA 7502 at San Francisco
Los Angeles → San Francisco → Seattle
Timetable, San Francisco time
19:00UA 3917 from Los Angeles at the gate
18:48AA 7502 to Seattle leaves the gate
23 h 48 apart on the timetable, overnight
AA 7502 leaves 23 h 48 after UA 3917 arrives on the timetable: more than half a day, so not a connection we count.