DL 2990 then DL 2891 at Atlanta
Jacksonville → Atlanta → Ontario
Timetable, Atlanta time
17:25DL 2990 from Jacksonville at the gate
16:55DL 2891 to Ontario leaves the gate
23 h 30 apart on the timetable, overnight
DL 2891 leaves 23 h 30 after DL 2990 arrives on the timetable: more than half a day, so not a connection we count.