B6 419 then DL 2891 at Atlanta
New York JFK → Atlanta → Ontario
Timetable, Atlanta time
17:32B6 419 from New York JFK at the gate
16:55DL 2891 to Ontario leaves the gate
23 h 23 apart on the timetable, overnight
DL 2891 leaves 23 h 23 after B6 419 arrives on the timetable: more than half a day, so not a connection we count.