UA 755 then TP 4392 at San Francisco
Reno → San Francisco → Boston
Timetable, San Francisco time
09:28UA 755 from Reno at the gatealso AC 4415, NH 7379
22:10TP 4392 to Boston leaves the gate
12 h 42 apart on the timetable
TP 4392 leaves 12 h 42 after UA 755 arrives on the timetable: more than half a day, so not a connection we count.