SQ 1460 then AS 591 at San Francisco
New York JFK → San Francisco → Seattle
Timetable, San Francisco time
21:37SQ 1460 from New York JFK at the gate
18:48AS 591 to Seattle leaves the gatealso QF 3787
21 h 11 apart on the timetable, overnight
AS 591 leaves 21 h 11 after SQ 1460 arrives on the timetable: more than half a day, so not a connection we count.