DL 977 then QR 2091 at San Francisco
Boston → San Francisco → Santa Ana
Timetable, San Francisco time
11:41DL 977 from Boston at the gatealso LY 4578
09:00QR 2091 to Santa Ana leaves the gate
21 h 19 apart on the timetable, overnight
QR 2091 leaves 21 h 19 after DL 977 arrives on the timetable: more than half a day, so not a connection we count.