QF 3673 then SQ 1491 at San Francisco
Seattle → San Francisco → New York JFK
Timetable, San Francisco time
16:01QF 3673 from Seattle at the gate
06:00SQ 1491 to New York JFK leaves the gate
13 h 59 apart on the timetable, overnight
SQ 1491 leaves 13 h 59 after QF 3673 arrives on the timetable: more than half a day, so not a connection we count.