CI 5346 then DL 543 at Atlanta
San Francisco → Atlanta → St Louis
Timetable, Atlanta time
03:10CI 5346 from San Francisco at the gate
15:45DL 543 to St Louis leaves the gate
12 h 35 apart on the timetable
DL 543 leaves 12 h 35 after CI 5346 arrives on the timetable: more than half a day, so not a connection we count.