DL 988 then DL 8771 at Atlanta
New York LaGuardia → Atlanta → San Francisco
Timetable, Atlanta time
16:28DL 988 from New York LaGuardia at the gate
13:46DL 8771 to San Francisco leaves the gate
21 h 18 apart on the timetable, overnight
DL 8771 leaves 21 h 18 after DL 988 arrives on the timetable: more than half a day, so not a connection we count.