DL 31 then DL 8771 at Atlanta
London → Atlanta → San Francisco
Timetable, Atlanta time
17:22DL 31 from London at the gate
13:46DL 8771 to San Francisco leaves the gate
20 h 24 apart on the timetable, overnight
DL 8771 leaves 20 h 24 after DL 31 arrives on the timetable: more than half a day, so not a connection we count.