UA 1243 then TP 4392 at San Francisco
Puerto Vallarta → San Francisco → Boston
Timetable, San Francisco time
16:32UA 1243 from Puerto Vallarta at the gatealso AC 5311
06:00TP 4392 to Boston leaves the gate
13 h 28 apart on the timetable, overnight
TP 4392 leaves 13 h 28 after UA 1243 arrives on the timetable: more than half a day, so not a connection we count.