CZ 1637 then AS 591 at San Francisco
Philadelphia → San Francisco → Seattle
Timetable, San Francisco time
19:28CZ 1637 from Philadelphia at the gatealso AA 3079, FJ 5029, BA 5439
18:48AS 591 to Seattle leaves the gatealso QF 3787
23 h 20 apart on the timetable, overnight
AS 591 leaves 23 h 20 after CZ 1637 arrives on the timetable: more than half a day, so not a connection we count.