DL 2391 then CI 5345 at Atlanta
Boston → Atlanta → San Francisco
Timetable, Atlanta time
16:35DL 2391 from Boston at the gate
12:45CI 5345 to San Francisco leaves the gate
20 h 10 apart on the timetable, overnight
CI 5345 leaves 20 h 10 after DL 2391 arrives on the timetable: more than half a day, so not a connection we count.