OZ 6344 then Y4 2443 at San Francisco
St Louis → San Francisco → Las Vegas
Timetable, San Francisco time
21:41OZ 6344 from St Louis at the gate
14:21Y4 2443 to Las Vegas leaves the gatealso F9 2486
16 h 40 apart on the timetable, overnight
Y4 2443 leaves 16 h 40 after OZ 6344 arrives on the timetable: more than half a day, so not a connection we count.