OZ 6344 then UA 1971 at San Francisco
St Louis → San Francisco → Chicago O'Hare
Timetable, San Francisco time
10:36OZ 6344 from St Louis at the gate
22:45UA 1971 to Chicago O'Hare leaves the gatealso AC 4200
12 h 09 apart on the timetable
UA 1971 leaves 12 h 09 after OZ 6344 arrives on the timetable: more than half a day, so not a connection we count.