DL 668 then QR 3391 at San Francisco
New York JFK → San Francisco → San Diego
Timetable, San Francisco time
10:35DL 668 from New York JFK at the gatealso LY 4439, VS 4745, LA 6225, KL 7260
10:29QR 3391 to San Diego leaves the gate
23 h 54 apart on the timetable, overnight
QR 3391 leaves 23 h 54 after DL 668 arrives on the timetable: more than half a day, so not a connection we count.