UA 796 then TP 4392 at San Francisco
Washington → San Francisco → Boston
Timetable, San Francisco time
19:24UA 796 from Washington at the gatealso VA 8391, NZ 9179
10:44TP 4392 to Boston leaves the gate
15 h 20 apart on the timetable, overnight
TP 4392 leaves 15 h 20 after UA 796 arrives on the timetable: more than half a day, so not a connection we count.