UA 573 then SQ 1491 at San Francisco
Burbank → San Francisco → New York JFK
Timetable, San Francisco time
17:45UA 573 from Burbank at the gate
06:00SQ 1491 to New York JFK leaves the gate
12 h 15 apart on the timetable, overnight
SQ 1491 leaves 12 h 15 after UA 573 arrives on the timetable: more than half a day, so not a connection we count.