DL 2599 then DL 818 at Atlanta
Madison → Atlanta → Dallas-Fort Worth
Timetable, Atlanta time
22:59DL 2599 from Madison at the gate
22:49DL 818 to Dallas-Fort Worth leaves the gate
23 h 50 apart on the timetable, overnight
DL 818 leaves 23 h 50 after DL 2599 arrives on the timetable: more than half a day, so not a connection we count.