TP 4401 then CM 1472 at San Francisco
Boston → San Francisco → Seattle
Timetable, San Francisco time
09:59TP 4401 from Boston at the gate
22:35CM 1472 to Seattle leaves the gatealso UA 5579, NZ 9401
12 h 36 apart on the timetable
CM 1472 leaves 12 h 36 after TP 4401 arrives on the timetable: more than half a day, so not a connection we count.