VA 8388 then CZ 1640 at San Francisco
Washington → San Francisco → Philadelphia
Timetable, San Francisco time
01:29VA 8388 from Washington at the gate
22:58CZ 1640 to Philadelphia leaves the gatealso AA 1826
21 h 29 apart on the timetable
CZ 1640 leaves 21 h 29 after VA 8388 arrives on the timetable: more than half a day, so not a connection we count.