OZ 6344 then UA 574 at San Francisco
St Louis → San Francisco → Phoenix
Timetable, San Francisco time
21:41OZ 6344 from St Louis at the gate
16:27UA 574 to Phoenix leaves the gatealso AZ 4502
18 h 46 apart on the timetable, overnight
UA 574 leaves 18 h 46 after OZ 6344 arrives on the timetable: more than half a day, so not a connection we count.