UA 582 then AV 2036 at San Francisco
Boston → San Francisco → Seattle
Timetable, San Francisco time
12:09UA 582 from Boston at the gate
07:25AV 2036 to Seattle leaves the gate
19 h 16 apart on the timetable, overnight
AV 2036 leaves 19 h 16 after UA 582 arrives on the timetable: more than half a day, so not a connection we count.