AS 688 then QR 3391 at San Francisco
Seattle → San Francisco → San Diego
Timetable, San Francisco time
16:01AS 688 from Seattle at the gatealso QR 2147, QR 2153, QR 3438, QR 4280
10:29QR 3391 to San Diego leaves the gatealso QF 3748
18 h 28 apart on the timetable, overnight
QR 3391 leaves 18 h 28 after AS 688 arrives on the timetable: more than half a day, so not a connection we count.