UA 2274 then TP 4392 at San Francisco
San Diego → San Francisco → Boston
Timetable, San Francisco time
09:20UA 2274 from San Diego at the gatealso AC 4193, AZ 4510, NH 7317, VA 8437, NZ 9598
22:10TP 4392 to Boston leaves the gate
12 h 50 apart on the timetable
TP 4392 leaves 12 h 50 after UA 2274 arrives on the timetable: more than half a day, so not a connection we count.