CM 1131 then UA 8172 at San Francisco
Eugene → San Francisco → Boston
Timetable, San Francisco time
21:05CM 1131 from Eugene at the gatealso AV 2270
12:45UA 8172 to Boston leaves the gate
15 h 40 apart on the timetable, overnight
UA 8172 leaves 15 h 40 after CM 1131 arrives on the timetable: more than half a day, so not a connection we count.