UA 520 then QR 2091 at San Francisco
Burbank → San Francisco → Santa Ana
Timetable, San Francisco time
11:18UA 520 from Burbank at the gatealso AC 3286
09:00QR 2091 to Santa Ana leaves the gate
21 h 42 apart on the timetable, overnight
QR 2091 leaves 21 h 42 after UA 520 arrives on the timetable: more than half a day, so not a connection we count.