OZ 6344 then UA 1372 at San Francisco
St Louis → San Francisco → Boston
Timetable, San Francisco time
21:41OZ 6344 from St Louis at the gate
12:45UA 1372 to Boston leaves the gatealso VA 8305, NZ 9010
15 h 04 apart on the timetable, overnight
UA 1372 leaves 15 h 04 after OZ 6344 arrives on the timetable: more than half a day, so not a connection we count.