UA 214 then UA 8222 at San Francisco
St Louis → San Francisco → Boston
Timetable, San Francisco time
21:41UA 214 from St Louis at the gatealso OZ 6344, NZ 9701
13:15UA 8222 to Boston leaves the gate
15 h 34 apart on the timetable, overnight
UA 8222 leaves 15 h 34 after UA 214 arrives on the timetable: more than half a day, so not a connection we count.