UA 3905 then UA 5621 at San Francisco
Tokyo Haneda → San Francisco → Eugene
Timetable, San Francisco time
16:33UA 3905 from Tokyo Haneda at the gate
11:15UA 5621 to Eugene leaves the gate
18 h 42 apart on the timetable, overnight
UA 5621 leaves 18 h 42 after UA 3905 arrives on the timetable: more than half a day, so not a connection we count.